My friends XT2 goes like a scalded cat. That XTM 24.7 engine is quite fast and scores well on the dyno, what fuel are you using?? My friend is running Byron 33%. maybe you could lean it out some more

Here`s the dyno results, just compare, the XTM 24.7 is quite powerful: http://www.rc411.com/forum/showthread.php?t=2202