I've heard the problem of the ball cups many times. And though, annoying as it is, I think that if it's the biggest problem on the car, then what a car!
With that said, that doesn't solve the problem
I'm a pretty inexperienced driver and as such I really thrasher around my TRF201 on the trackday I had back in October. My poor little chassis was being pushed around a lot by the bigger SC trucks, and despite that and my lack of driving skill, only one ball cup popped off (tie-rod, inside front, on the right side I recall).
The other time a turnbuckle went on the loose that day was when the ball connector itself broke
So what I'm saying is... Perhaps the TRF adjusters are worth a try? As for the shock shaft fasteners, if you buy the X-parts tree for the TRF dampers then you get 4 of those, some ball joints for the upper and lower mounts and 4 spring retainers. Ok, the spring retainers might be a little useless to you (especially with the big bore shocks you have) but the rest could be pretty useful parts?