Regarding the AcQc hand:

sometimes in a situation like this (depends on opp of course) I'll checkraise the flop as it sometimes freeze an opp on the turn letting you see the river for free.

Leading out on the flop here is okay too and might even be pushable if you're feeling really crazy (assuming that an A is no good but the Qs are, you've 12 outs; if both AQ are good you're looking at 15 outs).