Welcome to the forum!

Let's see, where to start... Just because you upgraded the saddle on the bike doesn't mean that you have the right saddle for you. The last time I needed a saddle for a bike - the one I had been happy with was no longer sold, so I had to start from scratch - it took me 4 saddles before I found one that worked for me. I tried 2 different Terry Saddles, a Specialized, and the one that I liked was a Fizik Vitesse. And I found that my body didn't like the feel of the saddles with a cutout. But we're all different... Check with your bike shop and see if they have a stash of saddles that can be borrowed / tried out for fit. You might want to check out the Favorite Saddles discussion (scroll down on the main page to find it, or click here).

On the back pain - you're right, it could be related to the reach. Do you have a WSD bike? Did your LBS really do a fitting, or did someone just eyeball you and the bike?

--- Denise