So, another round of RoadForce balancing and having the wheels mounted to a fixture and checked with a dial indicator. All check out good and within specs.
But it occured to me that I've been overlooking one thing. Most of my balance issues started when I added the BAER kit. I'm assuming it's possible my 13" rotors are out of balance. It's not unreasonable to imagine this - And I'm going to take this one step further. Apparently on a 9700GPS Hunter balancer you can actually check balance on a rotor. I'm going to take my rotors and have them checked - It's the last possibility I can think of.
I guess I'll report back if I get some positive results.