I started cycling again 2 months ago after a 6 year hiatus. I put 2600 miles on my 58 cm road bike back then and never thought anything of the fit. When I started up again, I realized just how stretched out my upper body was, so I swapped my 110 mm stem for an 80 mm version. That has made a big difference, but I don't think I'm satisfied yet with the fit. I am 5'10". I'm thinking about swapping my traditional geometry road frame with a 54 cm semi-compact frame. My current TT length is 57.1 cm. The frame I'm looking at has identical head and seat tube angles with an effective TT length of 55 cm. The only other difference is the BB is 1.2 cm higher on the new frame than my current one.
Do you think this is a worthwhile venture? I don't think I want to reduce the stem length any more. Would I notice the higher BB and corresponding higher center of gravity? Thanks!