Porpiosing and doesn't jump to a plane. 89' Rienell 5.7

I received a boat as a trade for some work I performed. Rebuilt the carb and fixed a few minor issues. Took it out but it doesn't want to get on to a plane without everyone jumping up to the open windshield. Then if they go to sit down it starts porpiosing again. I can't even pull a ski because a 120 lb kid keeps the front end up. I would think this motor should pretty much go straight to plane even with a 200 lb.man on the back. I can actually get it to plane every once and a while but it still starts porpiosing again. If I snake the boat it doesn't seem to porpoise but eventually will. This is a 1989 Rienell 192m cuddy cabin 5.7 cobra I/O

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