Hops seem to drop around 3 to 8 per growth per plant. A setup like below will pretty much gives you a over a stack a minecraft day. With the brewing of ale taking a long time and not requiring a lot of hops you will quickly have a major surplus of the stuff.

I'd suggest lowering the amount of hops dropped to 1 per harvest or increasing the amount needed for brewing.

Might be wise to have all the crops be configurable, could be handy for specific packs.

Going to add the output count as a config item.