Uh, Duh
The first thing to do is make sure the limb bolts are bottomed out, so after doing this, the brace and ATA are much closer, and the bow miraculously goes to 70#.
Now I've over-twisted the cable, and untwisted the string too much, but that is easy to remedy.

What effect would there be using a 452X string and an 8150 cable? The cable is a Shooters Edge 8150 12 strand.