[400TT]

I would swap the caliper and rotors from one side to the other.

If the problem moves to the other side, then swap back just the rotor etc. At least you will narrow down the source of the problem.

Not sure on those Wilwoods, but if you can't move the bleeding nipples you will have to bleed them tilted on the rotor so the bleed nipple is at the top, then bolt into place.

I'm guessing it's not going to be something simple, 2 x Brake places have looked at it. So it's time to narrow down where the problem lies, in rotor, caliper or further back in the system.