So I spoke with Rob from Rotorlab for about 35 min. Good guy.
The issue I'm getting is not the fault of the machined tabs... the issue is bearing runout on my wheel bearing/hubs...
They've taken a big beating having been driven in the northeast (haven't replaced them since I got the car and doubt previous owner replaced them), and you would never notice because the original calipers are sliding and compensate for any extra space that's given to the rotor, however now that I have a monoblock caliper, I notice the 2ish mm of runout that push the rotor out just that little bit... This causes the outboard pad guide rods to hit the outside face of the rotor...
This also makes sense with why both the fronts are identical with the mounting issues (bearings are usually replaced in pairs)...
So what am I doing about it? Ordering new wheel hub bearing assemblies... Hopefully I can take out the old and likely corroded and shitty bolts by the time they show up and have them in soon before I move to TX.
@manu97 the audizine guy had the same issue (for some reason only on one side) but articulated it differently.
In addition, Rob explained to me some extra instructions (which I'm shocked weren't provided with the dual rear caliper kit that I bought from ECS) on how to properly set up the rear parking brake caliper. You basically have to get in the car and push the button down on the handbrake while pumping the crap out of it until the piston meets the backing plate of the pads, at which point the handbrake is essentially (calibrated) for the distance to the pads.
