First, don't turn down the original shafts..save them to maintain the value of the cue. If you want a smaller shaft, go to a Predator, etc or have a custom cuemaker make one to the specs you want without destroying the value of the Scruggs.
I like 12.75...tried the Z shaft, but did not care for it. I have gotten used to the deflection of the Predator and have a difficult time when playing with a standard shaft, especially when you need to muscle it up and play with something other than center ball. The ball does not seem to react the same.