I had the same breaker tripping problem until I found, and lubricated the grease zirk fitting at the base of the hatch lift motor. Also, there might be too much weight in the storage compartments on the hatch
You may want to check for a clogged fuel injector. I had the same problem with my 6.2s last year. One clogged injector shut one cylinder down at 3000RPM.
I had this issue on our 2007 310 Sundancer, twin 6.2 Mercruiser V-Drive. Turned out to be partially clogged fuel injectors. Had them all cleaned and rebuilt. Runs fine now.