AZ, I know I already sent you a brief message on FB, but I have a couple of thoughts.
First, did the 47 cm Lexa have 165 cranks? I won't comment on the above discussion, but I *cannot* ride a bike with anything else, and my inseam is longer than yours. I just had a memory, in that when preparing for my trip to France, I was all pissed because the bike Trek was giving me (not a Silque, but some WSD Madone), the 47 cm had 170 cranks. They said they would give me a 44, which had 165s, but then they would have to mess with the stem. No way, I have been through that with my Kuota, so I bit the bullet and rode the 47 with the longer cranks. So, what I am saying is that if you put 165s on the 47, it might help with what you are feeling. You can also get different bars. Like I told you, I have Specialized short and shallow on my Silque. Cheap, alu bars!
Also, as far as spending an extra 500.00 for the electronic shifters and disc brakes, I would say it's worth it. I had the electronic shifters in France. While it didn't rock my world, like DH thinks (he got them on his new Time bike), they were fun and I had none of the problems with them, that I had read about. And, while you don't need disc brakes for wet weather in Tucson, they do work better. I had them on my mountain bike. It is true that you don't *need* either of these things, but if that's what it takes to get what you really want, do it.
I was told there was a huge shortage of 165 cranks when I ordered my bike, around the end of October 2014. They told me I would get my bike in late December or January. Well, I have a picture of me, riding my bike on November something, so that all went more quickly than I was told.