Uncheck 80 mhz (will not affect 135s or 125s, but uncheck it)
Change "Allowed Bands for 40mhz" to "none" (high density, we want 9 non-overlapping channels instead of 4)
Make Max TX Eirp 18 (cap the power at the max TX power of clients so they don't "stick")
Make Min TX Eirp 12 (allow the power to go lower if there is alot of coverage)
Test your stickiness after that.
Maybe they need to explain "buggy" so you can make your own informed decision about controller-based Client Match. It is not buggy in my experience.