1 - Difficult spot. I think I would just give up on this river, the ten is not a great card to fire again since JT is now never folding although I don't know if villain will ever show up with AT/T9 here.

Did you consider a turn check/raise? I think he has enough floats in his range to make it profitable, plus with your tight image he's going to be folding decent hands like pair+oesd and maybe even two pair. I don't think I've played with villain before (different player to Phideltx799?) so idk how capable he is of folding, but I do think it's a line worth thinking about.

2 - yeah I think we can bet this around $14. Better to get value here than on the river since he'll be calling all Js and all hearts and maybe even some Ax for the gutshot depending how bad he is, as well as worse Qs and hopefully some tens. Also I think you can definitely bet $7 or even $8 on this flop.