1 - when firing a 2nd barrel, the point is to use your FE to win the pot. So, the best 2 bar cards are scare cards, like an A, K, or a flush card. Here, the card doesn't increase your FE. He isn't folding anything he called you on the flop with so I take a free card always.

2 - I'd probably shove but I'm a spewtard.

3 - Agree with atothec