HV to MMM on my X1crt

anyone had problems with that 62 spur tearing up pinions in ten or fifteen runs.I tried it tight "just a hint of lash",i tried it at what i always thought was normal tick tick notebook paper set lash and it has burned up 5 or six pinions in less than two months and im only running once or twice a week no more than four or five runs a night. I run 12 and 14 mod 1's mostly 14's.Im just about ready to put an AE 48 plastic on and see if itll run fast & cool but greg didnt say what temps his MM2200 was running on his steel 48 and that info would be useful thanks