I have a cheap Humminbird 561, and if I turn the sensitivity up to about 90% I can see the thermocline. Right now it's at about 25 feet where I fish. You won't find bass deeper than that, but you'll find a lot of bass right at or above it. If you find structure on a point at that depth, you'll have a good chance finding fish, but If you don't get bit after ten minutes, move around on the point and look for anything different on your depthfinder, a treetop, a ledge, a pile of rocks, anything and try again. Keep moving 'til you find the bass. I use the gps anchor on my trolling motor to hold my position. If I was in a kayak I would invest in marker buoys.
I know a lot of fishermen don't like the Fish ID on their depthfinder, I'm not one of them. I not only turn on the Fish ID, I turn on the fish alarm as well. It's nice to hear that beep-beep when you're line watching, then you can glance at the depthfinder, see how deep the fish are marking and determine for yourself if they're bass or not.
A final thought, don't be afraid to change tactics. Just because you think the bass should be deep on points, doesn't mean they always will be. If you ain't catching, try something different.