Well, there's your answer; don't even bother with dual elevator servos. With a 7C you must link them together with a Y harness or matchbox. Without a specific program to individually adjust each servo, what good is it???

As for adjusting the halves with a single servo, its no different than any oither model so equipped. IOW, no big deal.

A 13x6 prop is WAY too small for a 120 or 125. You'll need a 15" high pitch for speed, or a 16" median-pitch for general use (better, IMO).

P.S.: I'll post a pic of the tailwheel this evening. I looked for a Klett web site yesterday, with no luck. I did have their phone number in Texas; I'll look for it too.