Tuscany is meant to have more relaxed geometry for long days in the saddle. 2 cm too short is a lot, as is the 3 cm shorter head tube. That said, your commuter may be an overly relaxed fit. Have you considered a longer stem and more compact drop handlebars? What stem do you have on it at the moment? You can go to 120 mm without affecting the handling unduly.
That said, if you want another frame, then the CAAD10 will be as light, stiffer and may have a slightly longer head tube (maybe). I also like steel, but it will struggle to match the weight of the Tuscany for the money you want to spend. A little more would buy you a 953 Genesis (half price). You can also buy an 853 Volare, but the matcvh would not be so good. Hora’s Ritchey would look good (grey steel) but not match the weight – a Ritchey WCS fork will be a lot lighter than the stock Real Designs Tuscany, unless you have something nicer.
You really need skinny tubes to look good with that Campag – this from someone who owned a Merlin Cyrene with Campag, which was basically the same bike with fancy engraving (I replaced it with a Shimano-equipped Giant Defy Advanced SL – which is in a different league to be honest).