Be more aggressive when he's not showing strength. The Q3 hand was an excellent place to raise on the flop or turn. The A6 hand was a tad more questionable because he's shown strength. There you need to know a little bit about what he's willing to open with. Against many opponents (who would raise regardless of cards), the push is a decent play. If you were play one of the opponents who requires a hand to make a move, however, then you can be pretty sure you're not ahead here and look for a better spot.