Not sure if I missed this but are you using a thigh loop in your setup? I am ready to give this method a try and have a set up I put together from existing materials quite like yours but no thigh loop. From reading this thread I guess the LB is a viable alternative.
I've never understood what the thigh loop is for, just seems to get in the way.
What I do after this initial setup is:
1. Connect into my tether/bridge, but keep it loose
2. Step into the foot loop, step up and wrap my other leg around the tree. It doesn't take any muscle as all you're doing is holding you against the tree
3. Move the tether up as high as I want, set it and adjust the ascender/prusik accordingly and sit down into the saddle
4. The foot loop tree attachment should be around you waist level, move it up to a comfortable height
5. Repeat steps 2-4
I only move up about 18"-24" per evolution but it's nothing more than stand up-sit down. For my foot loop, I don't raise it any higher than lifting my leg 90 degrees. For my tether, it nothing more than a comfortable height above my head, no need to reach way up. The trick is to use your hands to hold onto the tree trunk and use them to help guide you. When you stand, just stand straight up. Videos I've seen where they're wrenching their legs so high they're kissing their knees is pointless.
Doing this, I've never broken a sweat, never got tired and if I did, just switch legs. I figure once started, I can climb as fast as with sticks but it's not a race and I don't have to extend myself or use anything awkward like aiders or anything else.
I've had to do the "climb of shame" a few times and you can climb down the same way, just in reverse but rappelling is more fun.