I just got off the phone with Comp Cams. They think I have coil bind or the retainers/keepers are bottoming out on the guides. It's something to check. I haven't heard back from Scott Brown or Ryan Johnson yet.
That is entirely possible. Check for seal/guide to retainer clearance issues. I think you'll find it very close. I normally cut down all guides and install teflon seals, which if done correctly will eliminate any retainer to guide clearance problems. If I remember correctly you may run into clearance problems around .500/.520 lift. With your 1.6 rockers you could be dangerously close. Pop off a valve spring and put the locks and retainer back on and with a set of dial calipers measure the clearance between the seal and underside of the retainer close to the valve. This will tell you without a doubt if there is enough clearance there.