As chance would have it, I started messing about today with the pole heights on my ASAT Tribute Bluesboy, along the lines suggested by this blog post from Haze Guitars
https://hazeguitars.com/blog/how-to-set-pickup-pole-piece-heightThe idea being to get the strings (the unwound 'G'-string in particular) balanced in terms of volume.
I say "along the lines" of that blog post because you can't lower the pole-pieces on the Seth Lover humbucker below the surface of the cover. So basically, I mimicked that profile by raising all bar the 'G'-string piece above the cover plate; and then fine-tuned for string balance, starting with the D & G strings. I couldn't quite iron out the differences between the wound & unwound sides but I did manage to get the 3 treble strings balanced with each other, and likewise the 3 bass strings (I used Audacity to check to relative amplitudes, as well as my ears).
I then set the height of the whole unit with reference to the distance between the tops of the two 'E' pole-pieces and the bottom of the two 'E'-strings, just like you'd do on a (SSS) Strat. According to this recent post,
http://www.guitarsbyleo.com/FORUM/viewtopic.php?f=13&t=15020&hilit=Pickup+height, the recommended pickup heights for a Bluesboy are 3/32", treble and bass sides, for both neck & middle, so that's what I set the heights at. Bear in mind that because the lower 'E'-string pole piece stands more proud of the cover-plate than the top 'E', the unit as a whole still slopes down from treble-side to bass-side.
I was going to use that 3/32" recommendation as a jumping-off point, but no need. The neck p/up with adjusted pole heights sounds literally
brilliant at that height setting. Brilliant meaning bright and shiny. Couldn't believe it.
I went on to adjust the pole-pieces in the MFD bridge p/up too, again setting the heights of the 'E'-string pole pieces to 3/32" once I'd finished adjusting (again, they can't be lowered, only raised), but ended up at 1/8" (4/32"). Makes an appreciable difference but no nearly as much as it does with the SL humbucker on the neck.
So that would be my recommendation. Adjust the pole-pieces for string balance, and then set the height of the whole unit at 3/32" from the top of the 'E' pole-pieces to the bottom of both 'E'-strings. It'll only take a few minutes, and if you don't like it, it's a matter of only a few minutes more to return to factory settings. :-)