when i fish a worm under a float it's most likely on a jighead so a floating worm may have even more action as a result of it's bouyancy and it will get down and stay down in the strike zone on a 1/4oz jighead...what i have found to avoid slippage down the leader when drifted is to use as small of a needle that you can fit your leader material through and i've found that a jerkbait will not slip and bunch up the way an actual worm will, i prefer small sluggos