Nice!!
I've been using a Type 4A P pickup for about 10 years. I chose that design to make the response a little closer to the single coil type.
In the past, I've had Aeros in a Musicmaster and a J. Total "search over" both times - at least for the pickup!
I'd love to try a 4A set [with one pole under each string] in a J-bass, eventually.
So many projects, so little time...
I’m a little afraid this will be where I am headed after playing the P. I almost tried a set of Kloppman Jazz pickups but they didn’t fit the routes for what I’ve got in my Jazz now...Nordstrand NJ4SEs.