A lot of tuners are "above" tuning a Gamo, may be why you haven't gotten any responses. I count Gene as a friend, so take this as you see fit, but I've heard that he can do incredible things with a springer. Haven't actually had him tune a rifle for me since I don't do springers anymore, but he learned from one of the best, Charlie Da Tuna. You can spend more, but I don't think you'll get more. Later.
Dave