I am very interested in this as well. There is no information on the effect of damage on speed bonus, no numbers whatsoever.
I went with a strength stacking build because I don't really do full speed hit and runs. I fight around the infantry fight, focus on bumping and helping me team win the fight, but otherwise I wouldn't have been sure what build to pick either. Went 26/15 now, getting 9 ps in 3 million, but I am still curious how big of a factor speed bonus actually is.