I use a tablespoon of veggie oil to control the foaming when brewing in a 5 gal bucket. Works well...
I don't reuse the amendments after brewing... I tried to keep them in the beginning and they turn super funky and nasty so I've been topdressing the plants around my yard with it.
I've got a chem dawg out next to the tomatoes that is pissing skunk all through my property... love that roadkill funk!