How about going back a generation for your medium-light ball? I have a 15# 3" pin undrilled Reaction Rip sitting in my garage that I'm never going to drill. I will ship it anywhere in the lower 48 for $75.
Drill it around 6x5 and you have a great step-down ball from the Full Throttle / Detour arsenal that you are currently using. I haven't thrown any of the newer Columbia stuff, but I noticed you had a Wicked BRT listed in your profile. Back when I threw exclusively Columbia, I had both a Wicked BRT and a Reaction Rip, and the Rip was my step-down ball from the BRT. It was cleaner through the heads when the shot started to go, and it had a real good recovery and hit.
