In summer, fall and winter when the fish are stacked up often I don't use a bait or lure so much to cover deeper water but just use my electronics to scan deep water spots. I can ride over a spot in a few minutes and tell if its worth fishing. I covered a few miles of a Lake Horton yesterday under trolling motor power just riding over deep water areas yesterday and found only two spots of probably thirty I went over to hold active fish. When I found them I already knew I would get bites and could fish a slow moving lure on more specific spots since the depthfinder looked like this. Most of the fish in this school were crappie but we hooked two big bass and a few small bass out of it as well.
If the fish are more scattered in deep water a heavy jig, big spinnerbait, swimbait or a crankbait are my favorites.