Hand 1: Yes. You inflated the crap out of that pot. You were given a lot of opportunities to fold, but you didn't, and that is why the pot got so out of control will a marginal hand on a scary board. If I were you, I would just fold to the reraise PF, especially if he's a better player. It automatically removes you from marginal situations like these where you need a solid read to make the best decision, something which seems like you didn't have at the time.

Hand 2: Reraise PF to 65 ish. You are OOP with a VERY poor multiway hand. AK is a hand you want HU all of the time OOP. Lead the flop, there are WAY too many draws on the board to check. The turn bet is terrible. You are giving odds for any draw, and you are just asking to be raised. Make it at least 80. River bet is fine.

You say you would have reraised if you were on the button, but that doesn't make sense. You are OOP and very very vulnerable. You need to reraise so you aren't OOP on a multiway pot like this. BEING OOP SUCKS ESP IN MULTIWAY POTS! Remember that.

Hand 3: Don't slowplay unless you have the deck crippled on the flop. E.G. You have AA and the flop is AAK. Slowplaying is a bad idea on this turn because you clearly could get more money in the pot since people called your flop bet. Also, you could get some to bluff at you repping a 4. The key to winning at NL is to keep firing at pots, being aggressive with big hands so they will get paid off.

Reraising AI with AK against a maniac is fine. But I think you should reraise hands like KQ instead of just calling to eliminate making multiway pots that will make your decisions very difficult postflop.

Good luck!