The 2:1:1 is what you find in most research studies.
Having said that, I think there is room for improvement to that ratio. I SUSPECT, but can't prove that a larger amount of leucine is beneficial. I also think there is added room for L-Glutamine for several reasons.
Having said that, I don't think there is some magical ratio that's going to put things over the top. Rather, it is IMPERATIVE that you get levels up to 20-25+ grams in your peri-workout drink.
This 5-10 grams stuff is pissing in the wind IMO. Get them up to 20+ grams/drink at the right time (during the workout) and.... it's a game changer.
Credit Mauro DiPasquale/Charles Poliquin for changing my thinking.