1. This doesn't solve your ammo cycling issue - But, did you not shoot Maj Sub class? It sounds like you were playing against all the guys with bigger guns, smaller calibers and eleven rounds.
2. We shoot some GSSF, it's a family thing - very enjoyable. I usually shoot a 27 in the Am Civ class and my beloved 30 in Maj Sub. Of course, the margin of miss on the plates is 1. But a slow plate is much faster than a missed plate! Ask me how I know this.
3. I've used/using TG w/ 230's for matches. See the othetr thread in GTR for discussions about 185 vs 230. My notes have match fodder at 4.1 gr and 4.0gr TG. TG is faster than WST(my other pistol powder of choice/use) but scorches.