What I am trying to do is to find what works best for me.  I already know I do not like carrying more than 60 LB.  Adjustment of the pack can not only make it more comfortable but also make it take less time to cross a portage.  My  rout is 2.69 miles which is longer than a single trip across a portage.  I am trying to simulate a long double portage maybe near the end of the day. I have some other changes to test but I do not think I will see how comfortable it is to do naked ( a lot of multifora rose! Ouch).
Well it keeps me in shape anyhow.
Magicpaddler