I have been having the same problem. The eagle needs to be geared low to get any low end out of it. Mine is fast but it doesn't hold its tune very well but top end is not a problem mine i was clocked at 64 mph at the capital classic.

vincent jackson was clocked at 66mph which happens to be the new top speed record at 301 raceway previously held buy c-whit and his to3-t fx black mod jp at 64mph. you should work on your clutch,gearing and tuning because your eagle should be blazing with top end. good luck