For anyone reading who happens to chance upon the card forger event, I believe that a useful strat is to change most of your basic cards to 7s and 4s.
3 bumps up to 4 (one adjustment)
5 bumps down to 4 (one adjustment)
8 bumps down to 7 (one adjustment)
9 bumps down to 7 (two adjustments)
a deck of A 2 4 4 4 6 7 7 7 10 J Q K is absolutely worth paying the cost for 5 adjustments.