RE: Severne SSR Cam Rotation
What mast (s) you using in your 5.6 amd 6.6 SSR sails?
What year model are these sails?
From the Severne Sails archive, I see the following specs for the
6.6 461 193 Fixed 460 S-Racing
5.6 428 184 Fixed 430 S-Racing
So, to get the best performance and cam rotation you would need
A 460 cm IMCS 25 race mast for the 6.6 m2 SSR with no or a couple of cm of mast extension, and a 430 cm IMCS 23 race mast with no extension for the 5.6 SSR.
Have you examined the front "saddle" area of the cams to ensure that the cams are fitting onto the mast smoothly so they can rotate easily?
Sometimes a little "smoothing" of any high spots in the front of the cam can make a huge difference in how your sail rotates.
Also, are you sure you are getting enough downhaul to really "clean up" the front of the sail.
If you don't get enough downhaul on a 4 cam sail, the cams will not be "loaded" properly and the cams will tend to "knuckle" where they interface with the battens. This can really hurt the smooth rotation of the cams.
Since it's the cam above the boom that's "sticking" (also the cam and batten that are most affected by downhaul, or lack of enough downhaul) I'd guess that you either have a mast compatability issue or you simply are not getting enough downhaul to pull that cam back to an angle where it will rotate smoothly.
Hope this helps,