Oh, I misread the framedata, good shit on the double check. Anyways, you should stick to Lv2 anyways. You spend far too much time trying to build Charge. I would say you shouldn't spend anytime building charge at all. As long as you're CCing and AC(frc)ing you will get your charge, without having to sacrifice momentum or any sort of situational advantage. Plus, Lv2 Savage Fang is awesome. A move that is plus frames on block AND freezes inputs is an great offensive tool for a character like Order-Sol.
Also, anti-airing with GunBlaze has less to do with startup and more to do with positioning. I think about 90% of your failed AA GunBlaze attempts are due to a lack of position and not due to a lack of a fast startup GunBlaze. And reactions too. Sometimes people IAD on you, and you wait for them to get in position for a GunBlaze, and you end up with a crossup GunBlaze, instead of a guaranteed GunBlaze. What you should be doing is running up and meeting them in the middle. You need the reactions to get the positioning, to have the GunBlazes. Also, GunBlaze has the same startup and recovery in Slash and AC. Maybe my AA GunBlazes are just that much more awesome :O