I just use buttons fold SB and BB and attempt to steal stats to get a bit of a read on how he's likely to react to a steal from the cutoff.If hes folding his blinds a lot theres a pretty good chance he fold his button as well. Test them and see , if they are raising /calling you then you'll actually want to be raising decent hands in the CO , if not experiment with looser hands just don't try stealing every orbit from the CO.