This is kind of a flaw in the design and the reason for the fix on the TS55, but the TS75 has never been updated. The rear cam has the pivot in front of the contact point, so it doesn't have this problem either. That front cam though. It can drag and then it pulls the cam tighter. The pivot is essentially spring-loaded, so you can't really tighten it into the desired place.
The only solution that I am aware of is lubrication. Some silicone spray on the contact surface of the track and maybe some more on the cam is about all you can do.