By the way - I tried now to do a bodyweight RDL vs a bodyweight straight leg deadlift, and I could keep much more tension in my glutes during the straight leg deadlift.
Any idea what this means? Apparently when I flex the knees a ton of glute tension dissapears. So weirdly enough, when I take tension of the hamstrings I also take tension of the glutes... wtf... this occurs even if the knees don't go forward so it's a hip bend only, the only way I can maintain a HUGE amount of tension in the glutes is keeping the knees completely straight.