squirt, I've just read this post and before you start grinding check the thickness of your hull' bottom and if it isn't at least 3/4 inch at the keel I wouldn'd grind at all. I would rather use a poxy filler to the void areas. .100" is really not that much, I would worry about it if it was around a 1/4".If you had trimtabs in other boats before, that's when you actually feel the boat having too much vetted surface .One thing is very important on some boats that has 3/4 or less thickness bottoms to make sure yor trailer bunks exceed the stern of your boat.The vertical stern gives the most support for the hull resting on the trailer. There are a lot of boats with too short bunks which contributes to primature distortion of the hull bottoms.