M9 setting recommendations

Hi!
I have been using the M6 pumps (love them!) and decided to get the M9s for when I go back to work as back ups. I’ve used the M6s with the best output using stimulation mode on 2 for about 3-4 minutes then the rest of the time on Expression level 6/7 until I hit 20 minutes.
I tried a similar routine on the M9s but I’m not getting the same output. Any recommendations on settings?