I'm stumped[

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When I first got the MSR it was flying great. Now my issue is it will not fly forward as fast as it use to. I can barely make forward movement. I have tried trim and also move the battery as far forward as possible. My last ditch effort was to glue 2 copper BB's in the nose to hopefully get it moving forward. I know this thing was a rocket when new but no it will barely fly forward with full forward on the gimbal.
Looking at the servo travel it appears that I am not getting enough travel on the servo. I did take the linkage off and could'nt tell if there was any threads on the link but I tried turning the link to shorten the length.
Any ideas?
Larry