Help fixing a front brake bias problem

[Rwillia4]

OK since I purchased the car I have had a problem with the front right locking up under heavy braking. This is not to say that the car is stopping fast, before the tires locks up, it stops about as fast as my 3800lb truck. Under normal driving no problems and it doesn't wander or pull to a side under braking. The same type of tires are on both sides (I think, I'll have to check the tread wear/load rating, but they are both nitto.)
Things I have done to try to fix it:
alignment,
bleed brakes (by myself),
vacuum sucked to bleed brakes (it worked like the title "sucked", air kept getting in around the bleed valve),
swapped to SS brake lines
changed from DOT5 to DOT4,
bleed brakes (with wife helping),
bleed brakes (with car knowledgable friend helping),
verified tire pressure matching side to side,
dropped tire pressure in right front for testing,
changed brake pads (and made sure the pistons were freely moving),
tested with a guy weighing 300+ pounds sitting shotgun (trying to see if is was my weight causing the problem)


I bleed the brakes by starting with the back right wheel, then left rear, front right, front left. I do about 5 pumps then refill keeping the level high.

I can't figure out what else to do...

Thanks up front,
Rob