If the bass are suspended, you can catch them with a wacky rigged Senko, suspended under a slip float. Check the Senko articles above. There, I've outlined my technique, on just how to achieve success with it. It's easy to adjust the drop of the worm to their exact holding depth this way.
If they are on the bottom, then try drop shotting a 3" - 4" finesse worm vertically - right over them. Shorten the dropper so that your offering is only about 6" above the bottom. Do not over work the worm! This cannot be over-emphasized. A lot of long pauses between a few easy twitches, will get their attention.
If there is a stiff breeze and you are having trouble staying over them, I'd recommend anchoring; move the boat about 15 yards into the wind, ahead of the school. Drop the anchor and feed line until the rear of the boat is over them. The boat will swing slowly back & forth over the school and give you ample drop shot access to all fish there. Turn off your sonar as soon as you are properly positioned! There exists a lot of disagreement on the necessity of doing this; I do it just to put the odds in my favor.
At the same time you can put out your Senko float rig for added presentation and coverage. In this case of bottom holding bass though, adjust your Senko to hover about 2' off the bottom. The breeze will bounce and agitate the Senko, almost guaranteeing you a bite!
One of these two presentations will get you into your fish. Good Luck!