I guess that's why you (we) should read or study chess more, not just playing games. Personally I have a hard time with books. But if you just play 5 or 10 minute games it's hard to get out of the habit. There's just no time to explore new stuff.
I'm way too impatient for 15/10 games and I also have a lower rating there but I'm finally starting to play them more often to try and reach that higher level of concentration.
I've seen this countless times, in myself and others.
I improved a lot when I really started striving for accuracy but I know I still have this tendency to stay within my comfort zone.