Hi Hippie ! Bobber set depth can depend on a multitude of variables. Generally speaking in warming water I would say to 2.5 to 3 feet is a good place to start. Warmer days they may move up ; cooler days they may be deeper but you never really know until there are some on the stringer... Try different depths on different rods to hone in; such as 1 rod at 3 feet and another rod at 4 feet... During spawn they could be as shallow as 1 foot. In your neck of the woods spawn is about 3 weeks and a couple warm fronts away. If you want me to I will pm you the best bank fishing spot on Melvern that I know of.