I filed those tabs off to remove the gearbox binding as well. Several different gear boxes exhibited the same binding. I am not sure how you and I are the only people in the world to have noticed this, but we might be.
If you add a belleville washer to you RA bearing, (search this forum and documents for details...), that 3.15x hump in your PEMPro graph should move to 3.0x and then you can smooth it out using PEC from PEMPro to the mount.
