As a layman I agree--its going to be your burden to show your salary cuts were involuntary --keep it clean and factual. Were these salary cuts or cuts in hours or both ? Details may matter --we sort of expect folks to work a full work week --so if your hours were cut below 38-40 you may need to address a solid but unsuccessful search for added work --but I'm not sure we expect persons employed full time to get a new 2d or 3d job --unless they already had one --then quitting same might be an issue if you used a quit to seek lowered support --but thats not your question as posted.
Seems a good number of folks work off the books or arrange to get fired so as to sidestep CS--so to some extent you will need to be very credible and not step into any such mudpuddles.
That said, lots of folks are suffering wage cuts of late and if your wages were cut by no fault of your own you should be entitled to application of the formula to the new set of facts.
I agree--a short crisp credible summary of seeking better paying jobs would help your position as well.