I'm using panels on it, I swapped to hogue panels and it's a bit better but the frame ergonomics issue still remains (I don't really care though, I bought it for my collection, the Retro gets 99% of the field time).
Interestingly though, I put those panels from the Carter onto one of the Retros, and it's awesome! I might even like em better than the hogues, just the way they fit the frame and the profile from the back is hourglassy instead of mid-swelled. instantly felt like a high end 1911 in the hand, slim but hefty and balanced at the same time. Will investigate further