In a video clip somewhere, you'll find a hammocker, maybe a Brit, carefully placing several twigs under the rope he's suspended the hammock from, as he says to distribute the load more broadly (and in fact, that's smart; even if the max psi were the same, he's not cutting off as much flow in the tree tissue layers).
That's some extra, but no-weight fiddling. You could, however, have shorter than average pads which captured longer than average whoopie slings to distribute load, just as the adjustable shoulder pads on your backpack do. Say two feet long rather than six, but stiffer strapping; with a couple of pieces of combined male/female Velcro sewn to them at as few as two places.
- Hang the hammock loosely with just the whoopie slings.
- Slip the pads/straps between trees and whoopies and fold the Velcro over to keep the sling positioned over them.
- Adjust whoopie sling length.