I'd put him in the first hand on either AA or KK. Why re-re-raise with JJ? Doesn't seem like a good idea to me. If you are doing it though, why not make the raise something meaningful? At that point an extra 30 is chump change and has very little value.

Given the pf action and the huge difference in his play when the A came, I would actually think of laying this down here. I probably wouldn't, but I would think about it. Would also have reraised big on the flop though, meaning that I'd be pot committed before the A came, meaning that ultimately, I'd lose more here than you.

Second hand would likely play out exactly the same with many decent players. No issues, save perhaps the preflop call and that is easily justifiable given your stack and the way a lot of UB SnG players play at the lower levels.