Wow, stepping into the Axls from G3s is a world of difference in terms of control and power. The one issue I noticed after my first day out is a lot of heel rub in my boot, which is keeping me from doing as much of a knee bend as I'd like. Seems that, even in the lowest/front setting, I'm not getting enough toe flex and it's forcing my heel to come up in my boot to help make the forward plant. Any thoughts or recommendations on further adjustments I can make here? Maybe it's a boot issue, which are Ener-Gs, and they've just packed out too much?

Bootfitting is your answer. A heel wedge under the innersole helps prevent heel rub. They make straight and angled ones, which can also help with canting issues.

Take your liners into to get remolded, and make sure the heel cup is in a good position on your foot. Yes, it does take more force to flex forward, but that is what you want. Stop trying to put your knee down so much, and stay tall. It will improve your form, and give you room to absorb impact. If you're a lightweight skier, then you'll want to use those forward pin positions, but if you're bigger, and stronger, then you probably just need to adjust your technique. Be more aggressive, and the Axl will deliver all the power you need, right back to you. Enjoy!

I am having the same problem. I am using brand new T1's and Axl's mounted on Rossignol S3. I am 5'11 145lbs. I have tried all three positions but I definitely like the two tighter ones more. I get the heel rub on both of these positions though but I get more control ... any suggestions?

Also got similar heel rub issue when I started to ski with my AXLs in 3rd position with my old T1s. But after moving into 2nd position I don't have any problems. I guess it all depends on how well the boot keep your feet fixed while skiing/bending your knees. Can't help you with further binding adjustments though.