Just a note...

A stalled horizontal stabilizer results in a rapid pitch DOWN of the airplane...not UP.

Recovery from a tailplane stall is the exact opposite of the technique used to recover from a stalled main wing. Moreover, a tail stall is perhaps one of the least likely things you would ever experience in modeling, unless you fly in icing conditions which we don't usually do.

As for your PC-9 stab? Aside from the aesthetic appeal of a nicely shaped stabilizer, I wouldn't expect to see miraculous improvements in the models performance. Some improvements perhaps, but not dramatic.