Originally Posted by fronesis

Ah, that's interesting. I've got two different thru-axle bikes, and both have 15Nm specs. I think 11Nm is quite low for a thru axle, which is probably why the mechanic overtightened it. Of course, if it was stamped on the outside, that's still totally his mistake! And yes, once he's centered the caliper on an improperly torqued thru axle, the only answer is to fix it all: tighten the axle to the proper torque, lossen the caliper, then re-tighten. And it sounds like that's just what you've done!

As for the sticky caliper, I find when you are recentering the rotor its worth FIRST going ahead and removing the brake pads and carefully, slowly, and with a plastic tire lever, pushing both the pistons back to their zero position. That way when you recenter the caliper you are more likely to have the pistons balanced.