Most of my walleye in open water are caught on a fly rod. 7 wt with a type VII full sink line. I have lots of streamers but anything flashy and especially chartreuse. I've caught them in lakes and rivers using the same setup. My biggest was just over 10lbs (guess) our of the RDR. Didn't get a length but a hog for sure. 30 inches will be tough to get but 28 - 30 is a close 2nd that is achievable
Most fight poorly. Walleye just dog it...nothing special. The big one from the RDR was an exceptional fight. I honestly thought I had hooked a large pike from the fight. Better fight in spring, like June, and size in say a lake like Calling lake. A good example of where you could catch a 28+