Great looking bass dude! Bet it sounds great too... Clips?
I wish, but I don't have the ability to record anything at the moment. If I had my friend's Mac it would be much easier...
It's not that the magnetic pull is gonna effect the tone, is that the P pickup is 1/2 an inch closer to the neck on this bass. If you slap a P pickup on a jazz body in its regular position, it lies over the edge of the pickguard.
The reason why its positioned like that is because I had used a pickguard from a Mark Hoppus bass, which has the repositioned P pickup as a factory default. To be honest, I like it better because, as BigOlHarry mentioned, the sound is a bit more mid-focused but also a bit warmer, and much heftier because of the Quarter Pounder pickup. The positioning of the Jazz pickup was based on standard Jazz spacing because I wasn't going to have the existing cavity filled and re-routed.
Here's a less angled top shot:
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I had looked at Warmoth's more "traditional" P on Jazz pickguard, but I didn't find the look of the pickup protruding on the edge of the pickguard very aesthetically pleasing.
Also, the P pickup being in that position helps me cop Mark Hoppus' tone

Cool but I played a peavey the other day and the QP j wasn't nearly as hot as the QP p. If I had a P/J the j would be as hot as the p.
I have a Jazz Bass loaded with single coil Quarter Pounders, and by nature, they're not quite as hot as the Precision QPs. Besides, the bridge Jazz pickup doesn't have to match the hotness of the Precision in a P/J to add a little color to the P sound.
Unless you plan on soloing the Jazz - but a simple volume adjustment should do it.