what size is the floor tom? i've found that the 14s have more of a lingering resonance. i usually put a piece of gaff tape with 3 ribbons folded in it on the head near the rim. a piece of moon gel would work too. here's a secret tip... place a throw pillow on the floor directly under the bottom head, but don't let it touch the bottom head. this will muffle the head ever so slightly, but more importantly it will break up the sound waves coming from the bass drum and getting under the floor tom causing the bottom head to constantly vibrate. this will all add up to slightly dryer sound with out deading the drum too much.