My biggest fluke have all been taken in deep water. The big fluke like edges of broken bottom and smooth bottom. I do short drifts. Also the bigger fluke tend to travel in pairs or sometimes even in bigger groups. So if you get a real joe then mark the spot, either on the plotter or whatever else you're using. Keep fishing that spot. I've often put more than three joes in the boat on the same drift, just by keeping on it. But I can't say enough that the big fish seem to like rocks next to smooth ground. If the wind or current is really smoking I use a modified "race" bass rig--heavy bank sinker, long drop, to a smiling bill rip splitter jig--two hooks and one long long strip. Blue fish belly, bonita, fluke, squid...........................big being 10 or so inches.
I'm no expert but these kind of methods have put a good number of 10 pound-plus fish on board, the biggest being (not caught by me but by my friend

a 14 pounder) 100'