Hi, Just went through the same with an Evolution, What can I say, I like the stock harness.
This is what I did. Added hole with SS grommet to middle of the "Bungee Strap" and placed that on the upper bolt of harness. Had to get a longer bolt.
Placed Butt-Plate at base of AP Harness, melted 2 holes and installed SS grommets that line up to holes on Butt-Plate and used supplied bolts to attach.
This is working great for me, still getting everything dialed in, but really like the streamlined bailout.
I can post pics if needed.
CC