Dumb question, are y'all taping into the factory harness from the output of the amp to power the mids a highs, or running new speaker wire to each location?
Tap into factory harness where the B&O amp was. This gets you into all 4 doors. then run separate speaker wire to the A-Pillar tweeters. The factory ones are not wired to the B&O, rather an amp /module under the dash.
It is nearly impossible to run wires into the doors via the factory loom.