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Humps in my local lake seem to where the eyes hang out. 15ft to where it rises to 9ft seems to be the sweet spot in my local lake.
Do you set up directly on top of the humps or on the break of the humps?
I punch several holes at the different depths, set up tip ups, and jig...watch the vex you should see the walleyes slid in on the bottom. Jigging raps/shads, slender spoons, blade baits, jig w/minnow, also dead stick a minnow w/float near your jigging hole. Good luck