LISTEN TO THIS GUY, Rich. Find another shop. This "expert" is blowing smoke up you know where. You really need a certified fit technician. Trek dealers are usually not the best place to go for a pro fit, (I have a Trek too, and he "fitted" me by having me bring in my old 30-year old bike to take the measurements from).

I found the best fit people are at Specialized shops. And, they really don't care what type of bike you have. (disclaimer: after deciding that you need a specific sized something-or-other, they will want to sell you it. You don't need to purchase it from them. I was fitted with my Pinarello and wanted to keep it Italian, so I took the measurements and purchased my stuff elsewhere.) It will cost you a C-note plus, but is well worth the time and effort . . . and it will "fix" what's wrong.