Its a small company but they can be trusted and loved by many spyder owners for developing such an idea. OtterSC who i mentioned in an earlier post believes in maxxing out spyders to their fullest performance and not buying other markers for the sake of the hype as do many others. They can be made to v. fast low pressure markers if the time is taken.
Find some contact info on their site and give them a shout. Or try and get in touch with someone from Bad Company through Kingman USA (www.kingmanusa.com) and see if they can help u out with further AMG upgrades.