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I think you have over estimated the weight for your trailer, 850# is probably better than 1000# Did you reach up into the holes that you drilled to see if the foam was indeed wet?
Assuming you removed everything not attached to the boat.
2 batteries - 100#
trailer - 850#
10 gal - 66# (are you sure it's 10?)
engines - 230#*2-460#
stuff (wiring, oil,bottom paint) 250#
Total 1726#
Total weight with hull 3576#
potential water weight 104#
You are well within the weight margin of error and while you probably do have water in places, I don't think your boat is waterlogged. I would look for a different reason than water for the boat to list.
Does the current waterline follow the paint line? Have you actually measured the distance from a fixed point to the water line on both sides of the hull? Do this when you are not standing in the boat but wading in the water. You have twins, are they installed correctly? Measure the distance from the engine bracket to the side of the boat, should be the same on both sides? If it's not that could be your issue.
At this point, photo's would be helpful.