Try mugen yellow shoes, extra hard mugen clutch spring, 0.7mm spacing without inner bearing. Spring preload 0.7-0.9mm. Seems to works well for me on high grip med size track. Don't forget as the shoes need to run-in first (set preload to around 0mm, and run at 1/2 throttle) for 1-2 tanks, clean all the dust and check the spacing again.