Is it possible to consolidate your travels to either US or DL? Doing so will help you maintain or even reach a higher status with one airline that would be your main choice.

I have not mess with US website for a while but DL website has multi-city option. You would have to figure out the routing that maximize eqm with acceptable price first on ITA (look at stickies), then plug those intermediate cities (SLC, DTW, etc) as separate legs on your itinerary.

good luck,
drew