I've had my table for a year now. I've practiced 3C about 30-60 minutes per day, and I've gained a lot of table knowledge. My average went from what I thought was 0.7+ for only the first half-hour of play when my mind was fresh and then collapsing completely, to about 0.4-0.5 all of the time, even while exhausted and without thinking, and then occasional bouts of 1.0 level play. I feel like I've back-filled my foundation into something solid even if forward-facing progress looks slow, so I am happy.
I bought a course from Xavier Gretillat a few months ago and quickly realized that I have a HUGE hole in my knowledge with small games, mostly straight carom games. I am actually a bit better at one-cushion than I am with straight-rail, free game, or balkline. I've learned piqués and this has helped open up a lot, but still needs some serious attention.
So for the next year I am going to only focus on small games, with the hopes that I can keep clusters under control eventually. It is much harder than it looks.