I'm not a huge fan of getting 20bb in pre-flop with only A-10 unless you've got good reason although I'd be interested to see how the betting went down.
One of those tough spots but it's player dependent. If you think he is going to push back of you 3-bet then you have to decide whether you're willing to basically flip for stacks - but you don't want to be flipping for stacks too often in a tournament unless you have to. Probably better to do it later on when winning a massive flip sets you up for a very, very deep run.
But as I said, that's not necessarily a hard and fast rule.