I think I've fixed the extraction problem with the Charger (when using the 25 round magazines)... I changed a couple of things, so not sure of which produced the actual fix, but most likely the addition of an extra power extractor spring, though I did trim the inside of the extractor so it would get a better bite on the case, and cleaned up the bottom edge so it better fit the cylindrical shape of the casing
secondly changed the angle of the ejector on the magazine slightly more open, and added a bearing (from empty 22 case per YouTube vid) to tighten up the follower to the actual follower spring mechanism...
shooting with fist (wrist) to chin gives amazingly quick shots with the Vortex Spitfire