I hate to say it, but...
UPS might be your best investment. Send them out, get them back in 3 weeks, and enjoy. That's what I would do myself.
I'm surprised that Kirst supports use in Signature Series Colts, I had thought that they only supported Uberti and Pietta? Is yours a pair of Uberti kits? Might explain the fit-difference.
Dragoons for CAS? I like your style!