You didnt mention the size of the lake, depth, temps etc so I'll be generalizing.
Big pike and small pike are almost a different species. The big fish can definately be classed as a cold water fish. Your opportunities to catch a big pike in the shallows this time of year will be limited for sure & you can forget about the shallow back bays for anything but snot rockets. You should be looking at much deeper water. There may be small windows when they are feeding and may come up shallower but even these areas will be close to deep water, in the main section of the lake. Focus on any mid lake shoals, humps, points, neckdowns. Deep water, rocks, weeds are important... in that order. Big pike are top predators and don't need to hide in the weeds unless they are trying to ambush their prey. Trolling large body baits that will dive 18'+ plus and whacking the bottom is a good way to get them to go. However, your current gear will not suffice. If all else fails, go walleye fishn. Some of the largest pike are caught by unsuspecting walleye anglers.