I tested this on my ALOS interferometric pair (perpendicular baseline ~ 330 meters) because I also always struggled with ramps in my interferograms.
These are the results with 1st, 2nd, 3rd, 4th and 5th order polynomial degree for the orbit information (second image is coherence) and I am surprised about the difference this parameter makes.
The notes in the help section might also be mentioned here but I really wonder why no one by now came to this idea because we saw many interferograms with bad ramps in this forum already (including mine).
So, thank you again for introducing this discussion, I think this might also be interesting to many others.