Wouldn't the Walleye hammer the YP? As the Walleye get bigger, I would think they could eat any YP you have. Maybe keep a close eye on the YP population and fish the Walleye out if it gets too low? I know it is difficult to keep YP in a pond with LMB and I'd think Walleye would be just as bad or worse at eating YP but I am not too familiar with them. I chose SMB as a predator with my YP and bluegill with the hope they would control the newly hatched numbers while letting those that escaped predation to grow and replace the ones I caught out to eat.