Remember this about drop fishing, I feel it's very important.

Fish will move up to feed and then back off with virtually unpredictable frequency. You can go for an hour or more with no bites, then something triggers them, and bam you'll catch 3 or 4 in a row. You may have slid down and hit a sweet spot, but often enough it'll happen on the same areas of a ledge you fished hard for 30 minutes or an hour with no bites. You may hammer 5, 10, or more in a 15 minute period, then it's back to nothing for a while. I've had this happen repeatedly on Barkley.

Barkley can also deliver them on the drops almost non stop all danged day when the first move out there. Once you have a 70 bass day you'll believe.