Adding any forage prior to removing at a minimum of 200 pounds is in my opinion, a waste. I'd spend the cash and electroshock the pond next spring when the bass are shallow. That along with angling should give you a chance at removing the needed pounds of bass.
Unless you have decent say 30% or so, submerged vegetation cover, YP will likely struggle to maintain under heavy bass predation. You could stock large stocker size YP to maintain a fishery.
Getting GSH established in a bass heavy pond is tough. I'd stock 5 pounds per acre of brooder GSH in mid spring for best chance at establishment.
