diff --git a/core/assets/maps/saltFlats.msav b/core/assets/maps/saltFlats.msav
index 556b33700f..d0f1a672c4 100644
Binary files a/core/assets/maps/saltFlats.msav and b/core/assets/maps/saltFlats.msav differ
diff --git a/core/assets/maps/stainedMountains.msav b/core/assets/maps/stainedMountains.msav
index af3abb26c2..082f96ad7b 100644
Binary files a/core/assets/maps/stainedMountains.msav and b/core/assets/maps/stainedMountains.msav differ
diff --git a/core/src/mindustry/content/SectorPresets.java b/core/src/mindustry/content/SectorPresets.java
index 7e2586eb9d..dbfddbc142 100644
--- a/core/src/mindustry/content/SectorPresets.java
+++ b/core/src/mindustry/content/SectorPresets.java
@@ -24,6 +24,7 @@ public class SectorPresets implements ContentList{
 
         saltFlats = new SectorPreset("saltFlats", serpulo, 101){{
             difficulty = 5;
+            useAI = false;
         }};
 
         frozenForest = new SectorPreset("frozenForest", serpulo, 86){{
diff --git a/core/src/mindustry/content/TechTree.java b/core/src/mindustry/content/TechTree.java
index bf0f73c730..e68688b0b1 100644
--- a/core/src/mindustry/content/TechTree.java
+++ b/core/src/mindustry/content/TechTree.java
@@ -421,7 +421,7 @@ public class TechTree implements ContentList{
                 });
 
                 node(additiveReconstructor, Seq.with(new SectorComplete(biomassFacility)), () -> {
-                    node(multiplicativeReconstructor, Seq.with(new SectorComplete(overgrowth)), () -> {
+                    node(multiplicativeReconstructor, () -> {
                         node(exponentialReconstructor, () -> {
                             node(tetrativeReconstructor, () -> {
                                 
@@ -508,6 +508,7 @@ public class TechTree implements ContentList{
 
                                 node(saltFlats, Seq.with(
                                     new SectorComplete(windsweptIslands),
+                                    new Research(commandCenter),
                                     new Research(groundFactory),
                                     new Research(airFactory),
                                     new Research(door),
@@ -646,7 +647,7 @@ public class TechTree implements ContentList{
     static TechNode node(UnlockableContent content, ItemStack[] requirements, Seq<Objective> objectives, Runnable children){
         TechNode node = new TechNode(context, content, requirements);
         if(objectives != null){
-            node.objectives = objectives;
+            node.objectives.addAll(objectives);
         }
 
         TechNode prev = context;
diff --git a/core/src/mindustry/maps/SectorDamage.java b/core/src/mindustry/maps/SectorDamage.java
index 22f19c3e4d..78802f46bb 100644
--- a/core/src/mindustry/maps/SectorDamage.java
+++ b/core/src/mindustry/maps/SectorDamage.java
@@ -21,7 +21,7 @@ import mindustry.world.blocks.storage.*;
 import static mindustry.Vars.*;
 
 public class SectorDamage{
-    public static final int maxRetWave = 30, maxWavesSimulated = 50;
+    public static final int maxRetWave = 40, maxWavesSimulated = 50;
 
     //direct damage is for testing only
     private static final boolean direct = false, rubble = true;
diff --git a/core/src/mindustry/world/blocks/defense/MendProjector.java b/core/src/mindustry/world/blocks/defense/MendProjector.java
index cf71928f26..1c171edfdc 100644
--- a/core/src/mindustry/world/blocks/defense/MendProjector.java
+++ b/core/src/mindustry/world/blocks/defense/MendProjector.java
@@ -60,6 +60,7 @@ public class MendProjector extends Block{
         float heat;
         float charge = Mathf.random(reload);
         float phaseHeat;
+        float smoothEfficiency;
 
         @Override
         public float range(){
@@ -68,6 +69,7 @@ public class MendProjector extends Block{
 
         @Override
         public void updateTile(){
+            smoothEfficiency = Mathf.lerpDelta(smoothEfficiency, efficiency(), 0.08f);
             heat = Mathf.lerpDelta(heat, consValid() || cheating() ? 1f : 0f, 0.08f);
             charge += heat * delta();
 
@@ -115,7 +117,7 @@ public class MendProjector extends Block{
 
         @Override
         public void drawLight(){
-            Drawf.light(team, x, y, 50f * efficiency(), baseColor, 0.7f * efficiency());
+            Drawf.light(team, x, y, 50f * smoothEfficiency, baseColor, 0.7f * smoothEfficiency);
         }
 
         @Override
diff --git a/core/src/mindustry/world/blocks/defense/OverdriveProjector.java b/core/src/mindustry/world/blocks/defense/OverdriveProjector.java
index 7cadaede81..7e645e5a2e 100644
--- a/core/src/mindustry/world/blocks/defense/OverdriveProjector.java
+++ b/core/src/mindustry/world/blocks/defense/OverdriveProjector.java
@@ -65,6 +65,7 @@ public class OverdriveProjector extends Block{
         float heat;
         float charge = Mathf.random(reload);
         float phaseHeat;
+        float smoothEfficiency;
 
         @Override
         public float range(){
@@ -73,11 +74,12 @@ public class OverdriveProjector extends Block{
 
         @Override
         public void drawLight(){
-            Drawf.light(team, x, y, 50f * efficiency(), baseColor, 0.7f * efficiency());
+            Drawf.light(team, x, y, 50f * smoothEfficiency, baseColor, 0.7f * smoothEfficiency);
         }
 
         @Override
         public void updateTile(){
+            smoothEfficiency = Mathf.lerpDelta(smoothEfficiency, efficiency(), 0.08f);
             heat = Mathf.lerpDelta(heat, consValid() ? 1f : 0f, 0.08f);
             charge += heat * Time.delta;