After a lot of trial and error on Tacoma Rail's part, and some patience on my part, I finally got the Tacoma Rail Hill Job running to Frederickson with their new SD70ACe-P4's in DPU mode. This time they were taking 35 loads up the 3.75% grade. While they still doubled the hill, they took 28 cars in DPU mode, which is among the largest trains I've seen them pull.
TR 7001 pushing 28 loads across the Milwaukee Trestle
If you have 3 to 4 minutes to spare, you might enjoy this video of Monday's run.
Tacoma Rail's Hill Job at work