I was at qwerty speed with Dvorak in about 2-3 weeks as well. In the past couple years I tried Colemak, but I could not make the switch for some reason (from qwerty). I don't know why; I can't say it's because of the layout itself; could be that I'm 20+ years older than I was when I did the dvorak switch.

Your wpm is high. I'm in the 60s and Colemak actually improved my speed after a few months.