I think K9s is going a bit far but agree on a fairly wide range. A lot, however, depends on fold equity. These guys are usually pretty weak, but if they call you PF, they may also call you down with A2 if they hit their A. So, I'd try to be solid with my own kicker.

I actually often limp AXs here unless I have a lot of FE. I feel like I'm just getting a good price to see if flush draw comes up and keep the pot small when just the A hits.

Also, with 67s, sham, I think it depends on villain. FE speaks for raising. Also how he plays post-flop. If it's fairly easy to take down a HU pot even if he calls, then it's a good raise. And if it's not... hmmm... well, maybe then, too, just not putting any more in unless you hit. I think there are plenty of variations where you can make implied odds work for you here as long as you bet out your draw for deception purposes.

Anyhow, I generally feel like raising 76s here gives me more options post flop.