Recently got a used USA made Epiphone casino in royal tan. Dang what an awesome guitar this has been so far. Did some minor setup tweaking and it plays like butter. Loving the variety of sounds I can get out of these P90's with the hollow body: everything from almost acoustic sounding cleans to over the top blow your amp up fuzz tones sound great.
I've always heard P90's can really rip and can be almost as high of output as an average humbucker but I'm finding these don't quite have that much output. They do have a lot more output than my Strat pickups though but now as much as my Les Paul Standard with humbuckers.
I do think I might like a tough more output from the bridge pup which got me researching and I found a lot of people were saying P90's should be put really close to the strings, especially the bridge for the best tone. One article here: https://wgsusa.com/node/2730
suggests 2.6 mm for the low E string! They don't say where this is measured from though. Now it's tricky to measure the height because the bridge pickup on a casino is at an angle but at the closest point on the cover from the low E string when I press the last fret I'm about 4 mm away. If I measure from the top of where I currently have the pole piece set (which is obviously in the middle of the pickup) I'm right about 2.6 mm away from my low E string.
Should I be looking into shims? If so are there any that don't look ridiculous with Nickel covered dogears? I know some will suggest swapping to black covers but I don't like the black as well. I like the look of the Nickel on my Royal tan and for years have wanted that Nickel dogear P90 look on an ES style guitar so I really want to keep that vibe going.