Since i got my coaching i've been limping behind bad players with my drawing hands instead of raising to isolate when they limp preflop, in an effort to keep my preflop investment smaller and the stacks deeper postflop for making the implied value of my drawing hand higher.

I'm watching CTS play right now and he min raised to isolate a limper in front of him. I like this play as it's more likely to get you HU with the bad player, with the same sort of benefits from limping behind. The slightly larger preflop investment is well worth sacrificing for the other benefit of isolating -- increasing the size of the pot, which makes future bets into the pot bigger. This play seems fundamentally superior to limping behind a bad player, although in the atypical case where the bad player always reraised your min raise limping behind would work best.

A standard isolation size (5-6bb) is best when you don't expect your isolation raises to be 3bet light, and you feel that 15:1 implied odds or whatever with your hand is sufficient. It also is best to use when you feel your opponent will either fold often preflop, or give up often postflop.

To make this a theory post as well, i realized something fundamental about implied odds while writing the strategy part.

A player holds 22 and faces a standard preflop raise from a player whose range we know to be only AA. This player stacks off every time on the flop regardless of the action/board texture. Ruling out the occasional winning straight or flush or when our opponent also flops a set, we only beat our opponent when we flop a set which will happen roughly one time in eight. Therefore our preflop call only needs to be 1/8th the size of our opponents stack for us to have enough implied odds. Consider the same scenario, except now we know the standard preflop raise is 4bb and the effective stacks were 100bb. We would have 25:1 implied odds in this hand, but it wouldn't be any more valuable than having 8:1 implied odds like we had in the earlier example.

Summary: Once you have sufficient implied odds, you can't get "better" implied odds.