Hand 1: I think all better hands call you with SPR (sorry spenda but I think here its relevant) as it is. I also think the fact that the pot is multiway protects the pot from a bluff somewhat if one or both of them happen to have worse overcards. Check behind and suckout imo.

Hand 2: I fold this preflop OOP and with no reads. As played, its such a weird line for him to take, which I think makes it likely to be quite a polarised range. Its a shit scary bored for anyone to bluff at, and the best value hand you beat is A9, so the river looks like a fold.

Hand 3: I really dont know where we're at here. Im going to come back to it. My feeling is we are going to have to fold due to reverse implied odds, but who knows.

edit: I couldnt find this again for ages. In my experience those small cbets followed by large turn bets are one of 3 things.

1) He has a nut hand that wanted to extract a bit of extra value or get raised on the flop.
2) He had a weak hand or a draw, but the turn made him a nut hand.
3) He has air and is in "oh shit please fold" mode.

Oh shit please fold mode means he is fairly likely to bet the river with air when he has it, but even so we need to be ahead a lot here to call down 2 bets. If we will call a pot sized river bet and check down otherwise, and if he will bet the river with every nut hand and 1/3 of his air hands, then we need to be ahead 50% of the time already to profitably call down. In reality, lots of river cards probably scare him into not betting when he has nothing, or make him a hand that beats us which he bets, e.g. hearts, a straight card, maybe a K, and we dont have any real evidence that he is capable of having air here anyway. I think its a clear fold, but it would be nice to hear from some regs at those stakes.