Hand one and two, I think a flop fold would be the best play, hand 3 is difficult.

Hand one, the usual players re-raising range is JJ-AA,AK. your beating only AK, and opponant continues to show strength on the flop which implies he doesnt have AK. Ditch it on the flop.

Hand two, the Minraise into more than two people is almost always a huge hand, you show strength preflop and postflop, he knows you probably have an overpair - yet continues to raise knowing your probably not going away. If Villain had raised 3x instead of minraising then I would be more inclined to think my hand was good. dont put the extra $18 in and just fold the flop.

Hand 3 is very difficult, he raises but just over the minumum, on a draw heavy board to boot, two pair is unlikely - I think JQ/Flush draw/AK make up at least 80% of his range, if you like high variance push, if not, fold. I dont think either decision is much better than the other in this situation.