I think there is a big danger here of getting too wrapped up in hitting “the major goal” and ignoring the incremental and tangible improvements that are occuring overall. I’ve realised this recently in myself. My “major goal” with picking is to be able to play scale lines at around 200bpm (16ths). On my good days I might reach 85 - 90% of that with nice articulation and accuracy. My goal seems so close yet so far away and I’m really dissapointed sometimes when I benchmark myself against the goal and think about all the tunes I can’t play. What I have not realised until now is how much better my technique is sub 160bpm. So if I equate that to what I call “real world” playing i.e. pop/rock coverband material, my gains are massive.
Its kind of like the difference between exception/assurance reporting, where you only look at the stuff that went wrong and Quality Improvement, where the aim is to improve things across the bell-curve.
So @Regotheamigo, if possible (and it can be difficult for some to self-praise), can you identify any improvement overall beside your “main goal?” If you can, I would say CTC is money well spent and would encourage you to heed the advice given within this thread, with gusto. We are all here to help each other.