The combination of Predator 314 shafts and Schon always worked great for me. For my LTD Schon, I "upgraded" the original shaft to a Schon-314 shaft that was available at the time, it has both Schon and Predator logos on it and the joint is a Schon joint which is tighter than a regular 5/16x14, still un-played as my other, older 314 shaft still plays great.
I own a Predator Revo 12.9mm CF shaft, it works just great on the Schon cues I own as well. Keeps a good balance and it is one of the lowest deflection shafts on the market. I know some have issues with the Revo shafts, I don't.
I know that these are not custom shafts but Predator shafts have proven their products and performance while many custom cue makers and other production brands, use the term "low deflection" too loosely... I guess "lowered deflection" won't sell as good.
As I don't know how well is the 314-3 shafts is, I read that it's not as good as older versions (since production moved to China), If I were you I would just get a Revo shaft and if I had to get a wooden shaft, then I would look into the Predator Centro or Vantage but just because I've never played with any of them and I'm a bit curious about them.
I also own a JFlowers SMO CF shaft that plays great in my opinion (and also preform great) and the newer SMO-Wood is intriguing as well as they say it feels like wood and plays just like the CF version.