This is great, Swan. Please keep us posted on how you feel on your test bike, the differences on your rides. It's helpful to jot down notes of how you feel after your rides, areas you are sore following rides on different bikes so you can tell the shop pros. I did this when I was first growing accustomed to riding different test road bikes; I still do this as I'm getting comfortable with a more aggressive position on my road bike. I had my stem changed 3 degrees recently, for example, and if I felt any issues, I would take note. The shop pros should be able to address your pain issues as they work with you to properly fit you. I'm happy that you found a good shop. I'm looking forward to hearing about your progress in finding a better fit.