Did you find a solution? My 2015 190spx is having similiar situation. will not auto pump, so thinking float switch, but does pump water when I use the hard wired switch!
looks like mine is mounted on top hole pic included. not sure if it was mounted differently anything would change that much, but I will ask at my next service
I have 19spx OB and have found that you have less cavitation in full down position also. Has anyone tried different props? Or installed something similar to dolphin fin on OB? Have not been to happy with the handling of this boat, coming from 24' su...