In my local lakes this holds true during July and August evenings when the thermocline is most abrupt. I catch many smallmouth while jigging for walleye where the thermocline meets long tapering points. These spots aren't as productive during daytime. I think the walleye/smallmouth suspend at thermocline depth over deeper water during daytime and follow the thermocline to the points at evening time to feed. Every lake is unique, as my lakes are deeper than your's and the thermocline sets up at 33' depth. I don't catch largemouth on this pattern, so take my experience with appropriate grains of salt for your bass population.
oe