[Harv72b]

I raise the first hand, planning to check through the turn UI or fold to a turn donkbet. I call the c/r in Hand 2, planning to fold to a turn bet UI (hand 2 is an easy call as you not only have to the two overcards, but also backdoor straight & flush draws).

I think what's killing your profit margin in situations like this is not so much calling the flop bets, as it is calling the turn and/or river bets. Those BBs add up over time, especially if you're aggressive preflop. Also, note that these are just my default lines in situations like this--playing on 10/20 & 15/30, you need to vary your plays as many of your opponents will notice tendencies & attempt to exploit them.