My sled needs HELP!!!! 06 RTX with Ulmer stage 2, 144 gold diggers up the middle only seeling about 108 - 110 at best on the dream meter on hard packed snow, 10,800 rpms. Just barely out runs my buddies 600 sdi. It really rips out of the hole though (shorter races i have beaten several Apexs)... not sure what to do. I have discovered some idler wheel bearings were shot, will check em all soon. Any suggestions?? maybe try 23t top gear?