I'm going to get the fitting before I make any purchase. I'm going to call the shop today. I'm thinking a 100, but I don't want to have to buy more than one stem if there is a mistake.
I paid more attention during last nights ride. I get a little pain on slow rides because I tend to ride more upright with my hands on the hoods.... when I ride fast, I'm in a more aggressive posture and I don't get any pain. I'm naturally bending more at the hips. So as long as I ride agressively/fast, I'm fine.

I'm not going to do the MTB stem, the stem is too high as it is, i want a more aero position, and if I'm borderline now, flipping the stem will stretch me out that much farther.

Honestly, I'm so dialed in with this setup, I'm hesitant to make a change until next season... at this point, any major change may affect my performance.

thanks for the advice.