Currently at the lake and almost done with new power head break in. Mercury 200 efi #OT385030. Getting 15psi of water pressure via the gauge. Has a 6inch manual Slidemaster If I keep trimming up water pressure goes down and rooster tail gets above cowling. And it doesn’t want to get above 5k rpm. Running a 3 blade tempest 25p that marks prop shop took to factory specs. How to get closer to the 5,800k rpm?