As much as I love my ergoDOX, I am having the same issue, but I'm coming from using only two fingers on each hand to type and only using one of the shift keys. It means I can type really fast with one hand on a "normal" keyboard, but I'm terrible at a column keyboard.
Still, I'm learning quickly, and hopefully I'll be less embarrassed with myself later.
I have achieved my nominal speed on the ergodox after 2 months.
Today, it feels like home.
When I go back to a normal keyboard, I just want to kill myself. Show Image
(http://www.cute-factor.com/images/smilies/onion/042.gif)
welcome back.