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Message: <blockquote data-quote="wmk0002" data-source="post: 501064" data-attributes="member: 13975">The foam itself would have no impact as it weighs almost nothing and provides no bouyancy when the boat is floating like normal. In fact, the foam typically helps support the flooring if its thin and actually makes the floor feel more solid. I have foam under a floor made from 3/8" rubber mat and it feels solid. One thing causing it could be from the hull getting lighter by removing the bench seat. A lighter hull is more responsive to you shifting your body weight around. Was the bench filled with waterlogged foam by any chance or did you maybe use it for storage and since removed that stuff? The weight could add up quickly and make a difference. Also, by removing the lateral support of the bench the side may have a little motion in them that is transferred to the bottom which may be ever so slightly flexing. Could be contributing factors from both.</blockquote>