The worst hip pinch I experienced was with my trophyline several seasons ago. The Aerohunter Evolution was much better than the trophyline, but after several hours I would start to get some discomfort and get fidgety. The kestrel is a dream (for me anyway) compared to both the trophyline and the evolution.
I will say it took several seasons to get to the point where I was comfortable for the the majority of my sit. Now any discomfort I experience is usually foot-related (dang XOP seat beats out screw in steps any day of the week).
I am 6'2", 235lbs, size 2 kestrel. I like a 24" length bridge (under load - this is important because of iyou tie it off at 24" it will stretch even longer when you are hanging from it - tie it 16-18" and see if that doesn't help) eye level of lower hookup. Generally I stand/lean. Not much of a sitter on stand only to switch it up to keep comfortable every now and then. I run a ropeman on my tree tether, which eliminates the need for accessory cord and prussik knot that requires a much higher hookup.
Sorry to hear you're having issues though. Is this your first year using a saddle? Some of it might just be simply getting your body used to sitting and wearing in it.