why not take the pressure switch out of the equation all together? without the pressure switch, the accusump immediately oils whenever there is a drop. the concern as per the canton website is that you might run out of oil if it is supplying a lot without recovery ...
Importance of Accusump Valve Selection & How to Choose.
but perhaps go to a 3 quart instead of a 2 quart unit?
perhaps bypass the pressure switch for a session and see what response is like.
edit to add - my gt6 race car has an accusump with a manual valve, but currently no way to monitor pressures (it's from 1968 and a very analog machine ...)