I shoot inside by "feel" now as well. Takes A LOT of practice, but once you get it down its allllll good ! You know when you approach the shot just how much Inside to give it. There are a few distinct advantages to using "inside" , .... I adopted it when I noticed a short-stop using it quite often and he rarely misses !
I use it about 60-70 % of the time now, and I usually pot just over 80 % on average.
There are times you don't want to use "inside," and that is what is screwing me up now. :frown:
I've been using outside & inside english for more than 40 years. After some time shooting with CJ's TOI, it started to mess with 'my' feel outside english once in while & I was flabbergasted when I would miss what was a fairly easy shot when using 'my' outside english.
I finally figured out that I was aligning more as I would for using TOI while trying to use outside english. Once I realised it, it is just a matter of making sure I get the alignment correct for what I am doing. By correct alignment, I really mean what part of the cue ball to use as a sight line, through 'center' for TOI or from the inside edge for outside english.
I hope something I said here helps or at least gives you something to consider.
Best,
Rick