Thank you for explaining.Back in FTB BETA A you needed 10 seeds. The current DW20 and MindCrack packs both need 50 seeds.
You can change that if you want:
config\forestry\gamemodes\EASY.conf (if you use the easy difficulty, which is default in this pack)
squeezer.liquid.seed=20 // change to 100 to get the old 10 seeds/bucket behaviour back.