A few points,

1) Cold calling with AK

3Betting AK in 6Max is not automatic, because 6Max is a game where people are given a license to open, re-raise and over bet AQ, AJ, AT, AXs and KQ. When you 3Bet AK in 10Max, you're isolating your opponent and giving him folding equity. This is important, because there are more people and tighter ranges to consider. When you 3Bet AK in 6Max, you're getting AQ, AJ, AT, AXs and KQ folding equity, which is an inverse spew, because you could have got them to ship their stack on an Ace/King high board or sacrifice a CBet to a re-raise/float. You're giving AK, QQ-JJ the odds to push, losing Ace vs KK implied odds and you'll never be overrun by Aces or Kings pre-flop and the odds of pair vs set post-flop are trivial. If your opponent sets you, then it should be easy to weed it out.

I make more $ cold calling with AK in position than any other hand in 6Max, I've made so much $ that I'm even considering cold calling with AK out of position. When people tell me that KJs, KJu and KTs are UTG hands in 6Max, AK becomes a trapping hand for me.

2) Suited Aces are not another reason to re-raise, Suited Aces are another reason to call.

I understand that Suited Aces are + EV and that in a coin flip situation you want to get your money in with Max EV, but just because two cards are suited does not give you a license to over play your hand pre-flop, it's a warrant to see the flop. Suited Aces can turn into monster draws post-flop, so what was an unfavorable pre-flop situation can turn into a favorable post-flop situation with out your opponent even knowing it. Instead of getting into an unfavorable confrontation against QQ pre-flop with AKs where you can't do anything about it, now you're in a favorable position against QQ post flop where your skill matters.

You re-raise your Aces to off set your kicker, you don't re-raise your Aces because they're suited.

3) AJ and AT don't have to fold to a 3Bet.

Even tho' I'm inclined to fold these hands to a 3Bet, if they're suited you can cold call here to see the flop. If the Ace hits, then bet out into it once, and that should be enough to get them to fold KK-JJ, AXs or tell you they have AA, AK or AQ. If the monster draw hits, then you can just go for it. If they're unsuited, you can 4Bet bluff the button or the blinds, but I wouldn't recommend it.

As an aside, the biggest problem I have with AJ and AT is that TPTK has almost no Cbet credibility. If some one re-raises you, they may just be re-raising you with a pair, ace high or draw. What do you do here?

Edit: AXu is a decent hand for the SB to raise against the BB or for the BB to raise against the SB or even re-raise against the SB if he's active. I don't think you can afford to raise this hand from the CO of tho', if the button decides to defend or re-raises you, you are going to spew. AXs is about the weakest Aces you can play from the CO and show a profit with over time.