Finally got on the water this year! Got new Konrad 540PRS drives, cant trim motors under power, only at the dock??!! Any suggestions?? Trim tabs work fine, cant move the drives...HELP!

Your hoses on the pump are backwards, switch them as one is higher pressure.

^^^ what he said. Or, the pump is shot. I had a bad pump once. I'd have to back the throttle off on that engine, hit the trim switch quickly, and get back on that throttle to get the drive to come up when on plane until the new pump came in.