Like Chaadster I'd never heard of shoulder angle either. There are other established 'tests' for fit that we all are familiar with and maybe you could do one or more just for grins, and who knows it might even allow one of us fossils who aren't down with Generation X speak to help you. Have you tried locating your front hub when on the hoods? Is it hidden by your bars? In front? Behind? With your elbow against the nose of the saddle, where does the tip of your middle finger land on the bar? Does it reach? The 90mm stem will work but what I did was get a compact bend (Civia Emerson) with an 80mm reach instead of the 100mm reach that was causing me grief. What is the reach of those bars in the picture? FSA Wing Pro's are a compact bend as well and I have those on another bike. Worth a try.

H