I'm sorry if I offend any of you by using the word unpleasant.
I don't think you did. I think it's well understood it's just a pref thing, and like I said, it's totally cool. Really!
As far as unpleasant means. I notice on the p/j i played that the D and G lack of lows and lack of humf. It sound twangy and nasally. Which is unpleasant to me.
There's a few things going on here.
Let's toss aside the fact that a P pickup just sounds different from a J neck pickup for now, and talk about spacing...
First, the low strings on the PJ have the pole pieces about 28" from the nut, whereas it's about 1/4" or so less on the J, so even for the low strings, the neck pickup on the J is farther from the bridge. On the higher strings on the P pickup, they're even further back, so in theory, a P should have a thinner sounding higher section than compared to a solo'd neck J pickup.
Here's where the plot thickens a bit. At least on a Sadowsky PJ, the bridge pickup is also just slightly further towards the bridge. Not like 70's spacing, but just a bit... about 1/8" or maybe just a tad more.
So let's go neck and neck for a sec...
I'd have to do some direct A/B'ing I can't do right now, but I suspect the J neck pickup will have a slightly bigger and rounder low end, but not have the thicker woodier low mids of the series wound bigger coiled P pickup, which is what sets that pickup apart from the rest, and defines the magic of it IMHO.
From an overall sound perspective (blended)...
It's easy to see why the PJ is going to sound different and in some ways more aggressive than a JJ, and even differ from the low to high strings in this characteristic. Now, I kinda' like this, and have typically dug PJ's in general, but it is something that would be highly subjective and somewhat polarizing (as we've seen here).
Anyway, FWIW.