I have a Bianchi bike I built-up, not production bike. It is a Bianchi '98 Dedacciai Zero Uno Veloce steel frame. I added a threadless full carbon fork, Campy drivetrain with carbon crank, Topolino wheels, Ritchey stem/handlebar, Chris King NoThread headset, Selle saddle, and Alpha Q seatpost. Together, the weight is a sub-18 w/out pedals; near 18.5 riding weight with pedals, cages, bag, etc. Wondering if I should keep my set-up and change the Campy crank to compact for mountainous climbs, or buy another Bianchi frame to create a "climbing bike". Am I going to feel a BIG difference in climbing with a different frame and compact drivetrain? Or, is my roughly 4 lb. steel frame ok?