This season I've been messing around with weight distribution on the bike, trying to distribute weight more forward without changing the basic fit triangle between bars, saddle, and BB, by rotating the triangle forward around the BB. A more forward position feels more aerodynamic and control is much better. But as the triangle rotates forward, power and comfort starts to suffer as the saddle setback gets too close to being directly over the BB. I think this is all standard stuff so far.
I'm just under 5'9, fairly normal proportions I think, maybe my legs are a bit shorter than usual. My current frame is a 54 Tarmac with an effective TT length of 54.8 cm according to specialized.com, and a 100 mm stem. The saddle is far enough forward that I could run a zero setback seatpost if I wanted. I can't rotate any more forward on this frame without either changing the basic triangle (that is, changing the fit that works for me) or getting too far over the BB.
So I've been musing about downsizing to a size 52 frame with a longer stem. This would let me keep the same triangle and saddle setback (or even add back some saddle setback), but get more weight out front with a longer stem. With the caveat that I know fit is all relative and personal, I wonder if anyone here rides a frame that is "too small" for what their height would suggest, and what your experiences have been?