I'm loving it when people just brush aside any actual advice and go back to the good old common knowledge, like 'better take a nap than stress over it'.
http://link.springer.com/article/10.1007%2FBF02374224
One product that should be really good (I haven't needed it, and it's rather new) is Borocal, with calcium carboxylates, so no nitrogen that will itself induce some ber (like in the calcium nitrate).
"even though I picked them off the BER came back", yep, as I said.