Uploading a trip(route) from Basecamp to RV760..

I make all of my routes on my computer with no problem most of the time. I upload them to my RV760. Under "Transferring Routes" I place a check mark for "Always match route to map on my device when transferring". When the route is uploaded and I am ready to travel (all the same avoidances are marked on both Basecamp and RV7 60) the unit changes my route. At times it recalculates the route and it is anywhere from 20 to 50 miles different. When I upload a route I want the RV760 to use the route I upload and not revise it.

Is there a way to stop this?. I get 9/10 mpg when towing my trailer (38ft long & 15K) this can cause me a longer drive and anywhere from $10/50 more per trip.

Thanks
BC