Just some slightly thicker o-rings sorted the heave damper leakage issue for me. That's in mod racing too.

You guys have gotta try the new parts. The VTD, linear pullrods and the short RRS links. Together with the much harder roll damper oil (2 hole with 12k oil or no hole 2k oil). This has made a tremendous difference to my car on asphalt. I no longer have the unpredictable rear end! Very happy!