Did you measure at both the inside and outside FR bleeder? It would have to be some kind of debris within the caliper if there was uneven pressures side to side. Other than getting crud inside or a stuck piston due to a bad seal (usually) there isn't much that can go wrong with a caliper.

Is there an update to what was wrong with the car pulling to the left?

I have a 2010 Nismo and I have steering wheel and seat vibration at certain speeds, and under braking. The car pulls right as well. Here is what I have don't to try and fix the problem:

New tires
Road force balance
New rotors and pads
New brake fluid & several bleeds

To answer any obvious pieces of advice:

I've ensured tire pressure is always the correct pressure
I've had several alignments and tire balances.
The old rotors/pads had this problem and now have been replaced.
Rotors/pads were imbedded properly.
Pads have even wear as far as I can tell.

What is next in figuring out how to fix the steering wheel/seat vibration under braking and not braking? As well as the pulling right under braking.