My main clutch was fitted in 2013 and I have noticed the slipping for at least two years.
Part of the problem I have is the slippage when locking the clutch and releasing the sheet from the winch. It just occurred me to check the manual and the max line angle is 10 degrees. My winch is a bit close and just maybe the angle is greater than 10, but thats a bit hard to tell from a photo.
When I replaced my main halyard, the new rope was a bit slipperier than the old one. I took a couple of feet of small line, 4 or 5 mm in diameter and inserted it into the middle of the core of the halyard, aligned with the clutch when the main is fully raised. This effectively increased the diameter of the halyard so it no longer slips.
Of course, if you have worn cams, that won't solve the problem.
1) buy longer halyards than required, then shorten a meter each year, moving the clutch crush spot down the rope. Max 5 meters/years
2) you have 6 or more clutches, some high load, some low load, if wear suspected, swap the cams from the low load to the high load, should keep you going for a few more years, .keep a note of what swaps done.
guess you already thought of this stuff. But helps to know it's common practice.