1. i'm using agrarian skies 1.1.14
2. havn't removed any but added veinminer.
3. There was no roof
4.A single block, i'm gonna try the 4x1x1 :)
5. I had nothing connected
6. As i said i triedd with every watering system
7. Okay :)
So Your 4th idea worked, even 2x1x1. Thanks mate :)