from what im reading, it sounds like the back of the tremolo bridge is floating off the guitar, not flat. thats perfectly normal. if a tremolo was flat on the guitar, you cant lift the tremolo to make the note higher pitched, so the more your bridge is floating, the more range you have for getting a higer note. also, the more the bridge is floating, the less range you have for dive bombing, or getting lower notes. so its all up to your style. there's nothing wrong with a floating bridge. if you want to make it flatter, get a screwdriver and then wrap some pliers around it and open the back and tighten the screws to lower the bridge. i'd de tune a bit cause it could snap your strings cause it makes the strings tigher. also de tuning makes it easier cause theres less string tension. hope i helped.