Dwarven ghouls respawn rate

The game spawns an enemy roughly every 50 turns normally (35 when on a darkness level feeling), there haven't been any changes to that in a long while. Ghouls in particular do spawn in pairs, but they're balanced around that.

I've noticed sometimes I am gang-banged by spawns from all sides. This can happen on any level, and I am wondering if there's some logic in the code that ramps up the action if my level is above the dungeon level and I've been running around long enough. I've been killed by relentless spawning and running out of healing potions on levels -3 of my character level.

My current run, I came within a few points of death multiple times due to waves of monsters, but managed to pull through. Then it seems I sometimes get massive rewards for surviving it, like an awesome drop or a couple of rations when I've been starving for like 300 turns.

I've also been attacked in the garden rooms while trying to recover. That's described as a room specifically designed to give us respite from attacks to heal up. It sometimes seems like I'm cursed as a player, you know?

I feel like the spawn rate of EVERYTHING went nuts not too long ago. Feels like even in the early game I get no breaths between mobs and it's killing my runs.