Dunno if it's any help but I recently discovered that using very small brush sizes is extremely important to me drawing well.
The funny thing is that I've used to do that years ago but eventually grew out of it. I haven't drawn nearly as much as back then because I always got the impression that my art sucked but didn't know why.
2 days ago I was using a 1px brush and realized that this was much easier for me. I've been on a drawing spree ever since and I'm really happy.
Anyway, what I hope you learn from this is to always try other techniques, even older ones, and not to get stuck in your own perceived comfort zone. Stepping out can result in great improvements.
The road of learning doesn't always go straight. Sometimes you walk backwards or hit a dead end. Just keep trying though and it'll work out.