Kyosho 777 help needed

[pumpkinfish]

I need some help. Every time I drive my Kyosho 777 WC with RC Product Designs conversion, I end up stripping the spur gear after some hard landings or violent rolls. This happens maybe every other weekend of use. How can I secure the motor to the motor mount better? I have tried mounting the Neu with just screws and I have tried with screws and washers. Even with a hint of loctite. I have also ground some of the fins away on the can that looked too close the rear center brace hoping that might be the problem. I don't know what else to try. Would one of those band clamps that secure the rear of the can work? If so, where do I procure one of those? It is frustrating to have a crowd amazed at how fast and how awesome these conversions can be, then I hear the high pitch whine of pinion spinning freely and I can hear the mumbles that they are not ready for prime time durability wise.