Several factors contribute to large walleye. I am no expert but am taking 2 classes in fisheries right now at FLCC. One is all bait the management aspect; population dynamics, size, growth, and carrying capacity. The other is a hatchery class and we will actually be capturing walleye from honeoye and spawning them then releasing the fry back to the lake. The biggest mortality factor that limits wallet from reaching large sizes is from angler mortality. The legal limits is 14"? From the scale samples I've looked at a 14" fish is 2-3yo as a male and 3-4 as female. Females are not sexually mature until 3 males are at 2. Once a walleye reaches maturity it's growth level drastically slows. A few of scales we've looke at from 20"+ fish are 7years old or more. So what I'm getting at is that time to grow is probably the most crucial factor to a large walleye. Forage and healthy habitat is also important. I would love to see a slot limit in place on walleye, an honeoye, which has no naturally reproducing walleye, needs some real help. Hope this info is useful to you.
Ps. I live in Corning and would love to learn some walleye techniques if you feel like sharing. Best wishes.
Jeff