You said you toned it down, so I wonder how much immigration there was before.
The first groups were pretty manageable: 4 Dwarfs, then 11 and then 18. But the 2 next ones were huge: 41 Dwarfs followed by 37 Dwarfs the year after.
While I'm nowhere near having any supply problems (apart from constantly having to build more stockpiles, especially for tools, seeds, and foods), I can't keep up building bedrooms, especially since all wood was pretty far away, so getting enough wood for all these beds is pretty difficult.
Also, why can beds only be made of wood? And pillars not out of metal?