This reminds me I have to take my claw off and check what the state of mine is. I think the Touring claw is even narrower in the rear than the Roadster one but not sure.
The intakes definitely move up and down a little when the engine is running. The claw, meanwhile, is stationary. So maybe it's not just overtightening, with the claw pressing against the filter the way it is, it may set up a rocking motion that just causes it to start cracking over time. I believe this was speculated about earlier also.
The stock airbox leaves uh air between it and the claw so you don't get the same potential back and forth rocking going on there.
Been toying with the idea of pre-emptively shaving some off the Ramair foam where it rubs the hardest...