they are sensitive. there is also the temperature comphensation built into the CSC needle that you need to get your head around, ride hard enough and the shock gets stiffer after it heats up then slow down and after about 30 seconds it softens up, the difference is about 1/2 a CSC click, it is an advantage IMO but does make it more difficult to dial in at first.
I have the best success with the CSC wound in more and the reb/comp wound out than the other way around, I think because I need a stiff LS for my terrain.
the problem with the fork rebound is nothing unexpected and is something i've seen in just about every single set of forks/ shock Ive ever seen, even those with $1000+ revalves on them. to fix it you can adjust the rebound stack on the main piston for softer LS stiffer HS, sometimes a stiff single stage stack that lets you run the clciker further out helps too.
with the TTX though there is an oppourtunity to dial this out, as long as the balance between reb/comp on the main piston is about right all you need to do on the forks is try running the CSC out a bit more try 3-5 clicks softer and then wind the REB/comp adjusters in, that softens the LS rebound and stiffens the HS rebound, what you might find is that the LS comp is then too soft and need to tweak the stack.
what does the guy you bought them off have to say? there may be another way to adjust them that helps.
to make the CSC adjuster less sensitive you could try a 0.8mm bleed hole in the main piston. my thread "ohlins TTX shock" has some pics of some other stuf you could have a go at if you feel like really changing things.