I have never trolled crankbaits at thunderbird in the summer time. I mainly do that in early fall. But I guess it wouldn't hurt to try in the summer if nothing else is working. I have best lick with bright colored cranks on bright days and dark colors on cloudy days. I usually start with a few different cranks to see what they want then switch all to the same/similar color bait. I might even try troling some cranks prespawn just to try it. I'd be more than happy to take you out and show u how I do it. I'm no pro but I have learned a few tricks. Trolling is one of my favorite ways to fish. Probably cuz I'm so lazy haha