I try to keep the saddle low on my butt and legs only about 6 inches from my knees. so the belt is not rib height and then I try to have the pressure even throughout. I initially had my bridge too long it is now 24 inches and fixed. Sometimes I run an additional back belt under my arm pits. I have often unhooked the lower buckle... since I think it is mostly to keep the saddle up when walking into a stand. I loosen the leg straps so pressure is minimal and then tighten slightly. I have my leg straps crossed. Just keep playing with it . It took me 10- sits to get it the way I want. I seldom touch it much now. Also one of the straps adjust your angle from more upright to leaning back. How you adjust it is personal. Are you a leaner or a sitter. Where does the pressure bother you most.
I did not change the rigging plates but would like a picture of what Ernie did. Always looking for improvements. I doubt you need to change the plates until you keep playing with it .
Watch the new tribe videos and how Boswell adjusts everything. The video is very slow but does explain the adjustments. I have nice round abs or some call it an abscess
That is some of what I do but I do think it is hightly adjustable to fit all body shapes and you may do somethings different than me. I am 5 10 inches 200 pounds if that helps
And loosen the top belt and adjust the rigging plate outward