Hi, 88,
Seems like a match pistol should do better than 1.5" at 10 meters! Have you tried any actual match pellets? I know JSB has match pellets for pistols and rifles, I've used the Match Diabolo S100 ( the heaviest match) in my CFX with good results. RWS and H&N also do honest to god match pellets. As I understand it, you pay a premium price on match pellets for premium quality control. We all know what Crosman and Gamo's QA is like, just because it says match on the tin... Sorry I can't be more help here, I'll bet the guy with the answer is Pennsylvania Pistolero. Good luck.
Dave