Earth juice have good products , however I would have saved the cash and used unsulphered molasses ( 1 tsp up to 1 Tbls per gallon. ) it is organic and it's simple sugar structure would be as good or better than most " finishing " solutions. Also I wouldn't FOLIAR SPRAY anything on buds. It could lead to mold by having wet spots within buds.
If you are already getting to final weeks , there is NO additive that will improve your yield or weight.