The only true fix for the muggy clutch problem is 17mm hubs, truggy tires,12tooth vented bell and a fioroni twin turbo clutch. I tried all kinds of different 3 shoe set ups dynamite carbon, ofna, losi etc and softer springs. It would still cook the bearings. The fioroni turbo slider fixes the problem. On my sons muggy I change the bearings about every gallon not because the bearings failed but preventative maint, the shoes last 3-4 gallons and replace the springs aprox every 2-3 gallons.