Stem is on the short side, but its what I need fit-wise. More pictures to come, but though the weather in western PA has been nice for the season, I haven't had an opportunity for good (as good as iPhone pics can be) outdoor photos. In other news, this thing is an absolute rocketship. Stiff in all the right places, super smooth (though that's likely attributable to wheel/tire choice), and handles like a dream. A more complete report on the ride will come later, definitely after I've had a chance to race it, but preliminary observations are that everybody should try one of these before glossing over aluminum as a thing of the past. Only downside I can think of is the weight. As pictured and ridden, it weights 17lbs on the dot. Weird that I've gone from a 13.5 pound wonder bike a year ago to a no nonsense race bike.
Your stem length is fine. 8-9 cm is a standard length on a 54 TT.