...when I regen the world the village buildings are not the same. I regenned after a break and the buildings changed again...
I'm confused. You said the buildings were changing each regen, which is what they are supposed to do. Is that just a typo?
If they're not changing, then it's probably just random chance. I've never seen a village stay the same twice on the same seed, though sometimes they are quite similar.
I'm totally hooked on Agrarian Skies now. I've gotten myself to a just-barely-stable situation. On easy mode, I have some mob farms a ways from my house: I built three small rooms and closed them off so it's dark inside, then I go to the other side of the map, do a few things, then go back. I have them set up so I can kill stuff but it can't hit me. This is primarily to get zombie flesh for compost and bones for bone meal. I stick any flesh in the compost barrel, then take the bone meal to my tiny farm and fertilize the same plant as much as possible, harvesting any wheat when I can. If I have enough wheat, I then make a loaf of bread. Then I head back to the mob farms and continue.
With this method, I'm just barely staying alive. I got down to 1 hunger point once, just barely grabbed something to eat in time. Whenever I get more dirt from the compost, I use it to expand the farm. My hope is that eventually there will be enough wheat growing that I won't have to expand the farm any more, and can instead start sifting the composted dirt. I want to get some iron so I can make a bucket and expand the water (since the 2x2 square there is right now isn't really enough to fish), but I know that's a long and complicated process.
I have 2 trees growing at all times as well, but of course they take ages to grow. Now that I understand better how this all works, I wish I hadn't blown all my bone meal on trees at the start. Should have focused on food first. I also need to get more mob farms built, but right now I don't have the time, since I constantly have to try to keep myself above starving-level.