So ive made a spawn area with a roof (dark). Pressure plates detect mobs, Trigger water dispensers which wash them off a cliff for fall damage.
It doesnt spawn very many monsters.

. Maybe one every third day. I could of course increase the size of the spawn area but are there other techniques for this? If i build layer upon layer, each layer feeding into the same drop, will that have a multiplier effect?
Im unsure on the spawn rules. Logic says multiple layers = good but game logic might say otherwise. Thx?
Frontier btw, siff i need to say ...