Rega RP10 VTA shims

I am sure this applies to the RP8 as well. But I have an RP10 and bought two of the 2mm shims to accommodate the VTA of a Kleos cartridge. My dilemma is that the single shim does tighten the bass to where i prefer but the highs and mids drift from what I prefer. With both shims the highs and mids are, in my opinion, exactly what I want, but the bass control starts to slip away. Does any one know of a 3mm shim? I think that would bring everything into line. I will experiment with tracking force, but am reluctant to drift to far from 1.75 which was ideal on my old LP12. I looked at Acoustic Signature but this are drilled for the RP6 which uses a smaller screw. Also I am considering the Groove Tracer counterweight, but I really don't see that as the correct solution for this issue, but rather a tweak once the VTA is corrected. So my question is, anyone have an RP8 or 10 that has come across this issue and have you found a different supplier of shims for the Rega. I have thought about filing my extra 2mm down but realize I cannot maintain a perfectly flat surface.