Hey El, which screws, the overall PU height screws or the pole piece screws ? or both LoL. As RG says, best use your ears. start flat, neck and bridge PU height adjust so good balance between the 2 (as stings spin more over neck PU and why they are generally less output). The individual pole pieces can be adjusted to balance out the stings (depends lots on fret board radius) (e.g. staggered strat PUs). Changes of gauge will make a difference, more mass = more volume. I use 10 - 46 DR Tight Wounds (on all electrics), same gauge as other strings but a little more mass (tight wound). But whatever your taste in string, it's important to settle on the ones you like, like tubes, they all sound different and it's just one of the many variables you need to nail/decide on. As to a chart re string output, never seen one but who knows there may be such a beast.