There is a possibility that you have an opportunity to drain more oil out through the hull drain plug.
My 2002 SeaRay had a V6 Mercruiser.
There was an oil drain hose attached to the oil pan.
The hull drain plug had a snap swivel and some braided wire connecting it to the drain hose.
You may have this hose but it may no longer be attached to your drain plug.
A little contortion with a flashlight may reveal the hose and the possibility of threading it through the drain hole.
Mine drained very slowly due to the oil in the hose not getting as hot as the oil in the oil pan.
Good luck!
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