Those eno's are highly adjustable but proper heavy and quite stretchy, from what I can gather, they are not universally loved on HF.
Polyester is the best stuff for straps, its got hardly any stretch.
Paul Gibson from Arrowhead equipment makes and sells really light straps with a good rep on HF. They only weigh a couple of ounces compared to the 8 oz for slap straps. They come in camo too.
I can sew you a set out of some Vectran-core webbing if you like, they are zero stretch and the webbing is rated to 2100kg. They weigh 28g/m plus the overlap for the loops and the thread. PM me if you want them.