One reason, biggest reason really, I still shoot open is the harness.......
Even after 6 or 7 years of shooting FT, I stlll fell like Im timing over backwards a lot without the harness.
Wondeirng if a slightly higher seat cushion and a jacket will help that? The harness is pain, interferes with getting the USFT hardware down to my body, forces you out of a good position when extreme up or down shots .... and useless for standing/kneeling/prone.....
I know some positional adjustments help, but event then I still feel like Im rocking over backwards, unless tilted down hill to start with....
I love it. You sit and position yourself and there is where you stay. No sliding around like with styro.
Only bad thing is the weight increases.
Also I adjusted the harness until I got myself tight.
It will also help if you are shooting forward more than sideways, unless you support the rifle over your folded arm. Then you need to be sideways.