diff --git a/src/k_kart.c b/src/k_kart.c
index fccb6867..f33d84a8 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -4846,7 +4846,7 @@ void K_MoveKartPlayer(player_t *player, boolean onground)
 						&& player->kartstuff[k_growshrinktimer] <= 0) // Grow holds the item box hostage
 					{
 						K_PlayPowerGloatSound(player->mo);
-						player->mo->scalespeed = FRACUNIT/TICRATE;
+						player->mo->scalespeed = mapheaderinfo[gamemap-1]->mobj_scale/TICRATE;
 						player->mo->destscale = 3*(mapheaderinfo[gamemap-1]->mobj_scale)/2;
 						if (cv_kartdebugshrink.value && !player->bot)
 							player->mo->destscale = 6*player->mo->destscale/8;
diff --git a/src/p_floor.c b/src/p_floor.c
index 075ad1da..3365b4b9 100644
--- a/src/p_floor.c
+++ b/src/p_floor.c
@@ -3003,6 +3003,7 @@ void EV_CrumbleChain(sector_t *sec, ffloor_t *rover)
 	fixed_t topz;
 	fixed_t a, b, c;
 	mobjtype_t type = MT_ROCKCRUMBLE1;
+	const fixed_t spacing = 48*mapheaderinfo[gamemap-1]->mobj_scale;
 
 	// If the control sector has a special
 	// of Section3:7-15, use the custom debris.
@@ -3034,16 +3035,16 @@ void EV_CrumbleChain(sector_t *sec, ffloor_t *rover)
 	rightx = sec->lines[rightmostvertex]->v1->x;
 	topy = sec->lines[topmostvertex]->v1->y-(16<<FRACBITS);
 	bottomy = sec->lines[bottommostvertex]->v1->y;
-	topz = *rover->topheight-(16<<FRACBITS);
+	topz = *rover->topheight-(spacing/2);
 
-	for (a = leftx; a < rightx; a += (32<<FRACBITS))
+	for (a = leftx; a < rightx; a += spacing)
 	{
-		for (b = topy; b > bottomy; b -= (32<<FRACBITS))
+		for (b = topy; b > bottomy; b -= spacing)
 		{
 			if (R_PointInSubsector(a, b)->sector == sec)
 			{
 				mobj_t *spawned = NULL;
-				for (c = topz; c > *rover->bottomheight; c -= (32<<FRACBITS))
+				for (c = topz; c > *rover->bottomheight; c -= spacing)
 				{
 					spawned = P_SpawnMobj(a, b, c, type);
 					spawned->fuse = 3*TICRATE;
diff --git a/src/p_inter.c b/src/p_inter.c
index cd0ed893..05001ced 100644
--- a/src/p_inter.c
+++ b/src/p_inter.c
@@ -395,7 +395,7 @@ void P_TouchSpecialThing(mobj_t *special, mobj_t *toucher, boolean heightcheck)
 			P_SetTarget(&special->tracer, toucher);
 			special->flags2 |= MF2_NIGHTSPULL;
 			special->destscale = mapheaderinfo[gamemap-1]->mobj_scale>>4;
-			special->scalespeed <<= 1;
+			special->scalespeed = mapheaderinfo[gamemap-1]->mobj_scale/6; // (FRACUNIT/12)<<1 but mapheader-scale-considering
 
 			special->flags &= ~MF_SPECIAL;
 			return;
@@ -3329,7 +3329,7 @@ boolean P_DamageMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, INT32 da
 			if (!player->kartstuff[k_invincibilitytimer] && player->kartstuff[k_growshrinktimer] <= 0)
 			{
 				// Start shrinking!
-				player->mo->scalespeed = FRACUNIT/TICRATE;
+				player->mo->scalespeed = mapheaderinfo[gamemap-1]->mobj_scale/TICRATE;
 				player->mo->destscale = 6*(mapheaderinfo[gamemap-1]->mobj_scale)/8;
 				if (cv_kartdebugshrink.value && !player->bot)
 					player->mo->destscale = 6*player->mo->destscale/8;