Probably dont limp behind 1 caller with A6 off PF.

On flop it's definitely good to raise, but here is an excellent spot to raise about 2.50-.275 to make sure you're heads up against villian and for more value.

Better raise sizing on turn, perhaps raise more with the FD there. There really isn't much in his donking range that beats you on either street.

It's unlikely that much of his range is now beating you on the river and the FD didn't complete, so yes, again , raise for more value.

But try not to limp this in MP! Raise or fold weak aces if you want to play them.