I know, I know, get a professional fit, etc. But first I want to make sure I get the right size.

I'm 5'6 1/2", short 29 inch inseam, quite short arms. Originally I thought that a caad10 in 50 would be perfect, but when I tried it, it felt quite weird. I can't really describe it, but maybe a little bit stretched out, with a 100mm stem (it also had a huge stack of spacers). So now I'm testing a caad10 in 48cm with a 90-95mm stem.

I don't feel cramped on it, it handles well, it climbs well, but I feel like it might be small, with a little bit less reach I need. I will try to put on a 110mm stem on it, move down the bars a couple of spacers just to get the feeling.
In general I like to have big saddle-bars drop and on my smaller bikes feel much more like I "own" the bike during a hard climb. But this might be a little bit too small.

What's your take based on this info? The LBS said that I can be fitted on both frames probably (regular LBS BS).