Suspend-dots were once available to add to lures for more depth, but I haven't used them or kept track of whether they are still available. The old-school trick I've used with success is to add a few neat wraps of thin-diameter solder to the shank of one or more hooks on jerkbaits. You can easily adjust the amount, it's placement, or remove it completely, as needed.
On the jerkbaits I used, I found that solder should never be added to the tail hook. The middle hook was usually the best place to keep the tweak neutral to the lure's action. Sometimes it was possible to add a bit to the front hook, but I didn't try this very often. Adding solder to an already deep model made for an impressive depth range when matched with a thin line. I saw this make a difference on quite a few occasions, especially with a cold surface layer that had pushed bass deeper.
Edited by Flippin-Out (10/25/15 07:47 PM)