As someone who struggled with tilts for a long time, I can tell you that you're going to have to adopt that level of precision and control over the control stick for so many more things that doing tilts will be the least of your problems. So regardless, like it or not, you're going to need to have that dexterity to get better in general anyway.
I literally don't think I've legit gotten an input error/smash out of a tilt attempt in... months, if not longer. I mean, assuming a fairly normal environment. Like, not wi-fi and not during extreme tech moments, I guess?
I dunno, it's just not a problem for me anymore. I mis-input a higher percentage for L-cancels than tilts, I'll put it that way. Probably could chalk it up as a 99% tilt success rate.
My advice is just to learn how to move the stick efficiently. You want your tilt to come out asap, but you don't wanna flick it. "Glide it" I'd say is a good way to think of it. I find just barely moving the stick up/left/right/down does the trick. Like, you shouldn't have to move your thumb further than halfway to the stick barriers to execute a tilt, I'm pretty sure.
Furthermore, practice it. In particular, practice it out of L-cancelled aerials. I find this movement much more fluid than anything. I seem to prefer, aerial with L-cancel > uptilt. Not sure why. The time it takes for you to land and L-cancel should be enough time to move your stick to the proper position.
This is by no means a perfect or single-best way to learn it. We're all different. The above is just how I feel about it.