Yep, Arch did some research on it. Take a look at this:
http://www.wipeoutzone.com/forum/showthread.php?t=6602
Only 3km/h per 1 speed stat seems like such a useless speed increase, I know, but it really does make a difference when playing (especially for TT). But good thrust and handling can compensate on corners for lower top speed. This is why EG-X doesn't have high handling - it would be unstoppable.