I was wondering if the boot forward lean for a touring ski boot needs to be readjusted for missions that involve carrying a backpack in the range of 15-35 lb? I was recently skiing a touring setup on the resort and didn't have any issues at all. A month later I toured with 15 lb backpack and on the way down something didn't feel right with the balance on the very same setup (I had an excessive burning feeling in the quads just above knee area on the way down); based on how far I went and what I skied I shouldn't have been tired like this.

Any suggestions for checking the forward lean at home? I have two sets of very different boots so if there is a more or less universal method it would be very helpful.