I sifted through this thread and discovered I hadn't posted my P/J-related findings and updates, so here I am remedying that oversight.
Last year, I had some additional routing done to my "Projekt Blue" parts-bass. Originally, I had used a Blacktop Jazz pickguard as a J/J-to-P/J conversion template.
Of all the split-coil-bearing Jazz basses I've encountered, the Blacktop's neck pickup placement is the closest to the neck pocket, while the Aerodyne is a smidgen closer to the bridge. However, after reading
@Reggie Hamilton post to a TB thread about the engineering put into the placement of his signature Jazz's neck pup, I decided to give it a go.
Thanks to the fine people at WD Music, I got myself a reproduction of a Reggie-sig pickguard and had it routed out a bit more, as seen below…
In my final analysis, I can say without reservation that between the Aerodyne, Blacktop Jazz and the Reggie Hamilton Jazz, Reggie's has my favorite pickup placement. The growl and grind of the others are quite excellent and give them their own, distinctive sound,
but if you're looking for that classic, fat, Precision sound in a Jazz package, a Reggie-sig should be high on your list of considerations.
On a related note…I'm giving some thought of doing a similar conversion to a Classic '70s Jazz. I'm rather curious how the deep, Precision "thump" will blend with the extra "growl" of a bridge pup in the seventies-position.