Another vote for the Sole foot beds.
I had a pair that I forgot about and just recently put them into my shoes. My knees, legs and feet feel much better now while rucking.
For a little background I'm at 70lbs dry weight with the Soles in a pair of Salomon XA Pro 3d's*. With my old inserts I felt like 70lbs was pushing it and not in a good way. With the Soles I feel like I could get in another 10lbs maybe.
Another great advantage of the Sole is that it is heat moldable to your feet but not at the cost of a true custom footbed from an ortho.
The only disadvantage to the Soles is the material next to your foot is very rough. I like to run, ruck and workout without socks because my Salomon's are so comfortable. Now blisters and hot spots are a serious issue for me. But this is minor in comparison to the positives listed above.
Link for the Soles:
http://www2.yoursole.com/why_sole/
*I'll be sending a pair of Jungles out soon to Clark's to have them tricked out and will probably buy another pair of Sole's for those as well.