Hiya, :)
I just checked my B.K.Pd Les Paul and Archtops - and somewhere on each there are places where the strings are only about 1mm into the pole screw/line, due to pickup ring placement-relative to neck - or some minor issue. This seems to be especially noticable ( as I seem to see with yours too ) at the outer two screws of the bridge pickup.
I actually tend to (accidentally ) increase the pole/string spacing gap on my Archtops, where I prefer the whole floating bridge to nudge about 0.5-1mm towards the Bass strings, so I get a better fingering of chordal movements on the top 'E'- - and consequently a firmer note. In all cases , I have never noticed any volume / tone/ signal disadvantage - for ( As Antag said ) the strings are well within the magnetic field at it's strongest, EVEN with the relatively weaker magnetic field / pull / output of my Manhattans. :)