Well, although owning the car from the very first days it came out, I only finally tried the LRC block last night...
Wow, the car's a different animal with that on. It was sketchy as hell and I fought it most he way round a lap, and the jumping, well, if you were not 100% dead straight on the jump, god help you, it went in all directions!
So, I put the HRC block back on and boy, what a smooth beast we had now. Felt so much better through pretty much all the lap.
The shocking part... I was Slower! So, the first time I ever use a LRC block and I'm immediately quicker... I think I need to re-think a few things and do some testing.