I don't think there really is a wrong shot here. It looks like your opponent is going to have some type of bank left no matter what. If they can get out being down 6-3 from here then they deserve the game.
I think getting the 6 up near the 1 as close to the rail as possible is a good play. Leaving it on the head string or lower could give your opponent another ball if they make a bank and giving more options on turning the game in their favour.
No, I don't think you can be thinking that. At even moderate levels of play (to say nothing of the higher levels) both guys should be a threat at 6-3 with the balls like this (the 8/9 combo bank favors him defensively and offensively), not necessarily to win outright, but to tie the game or or at least get two and draw within one. If I've got a three ball advantage and only need two I have to fight to keep it.
Lou Figueroa