OK, I have a MIM jazz F/L. I've read about all the popular upgrades but I'm happy W/ it the way it is for now. BUT, the one thing that does bother me is the amount of (directional) hum it picks up. I haven't seen anyone mention shielding the control cavity, just swapping out pups. I actually don't have a problem with the sound of them. They blow away my carvin pups, so why not keep 'em? So if I wanna get rid of this hum, will shielding do it for me? Or is it all in the pups?