Suicide shells and the like are actually slightly smaller because you dont get the little gap between the 2 halves of the shells as they are a one piece construction.
I sold him the ETEk and it is a PE CCU kit on there NOT aftermarket.
Spoke to Darren who I got the ETEk from and he has never had any problems so I would say its the loader. Wouldnt imagine Planet selling one CCU thats different from all the rest
Nige