full shred in the neck? If you think the PAF Pro is muddy. I'd go with a Seth Lover Model before an Al pro II....Just like Webb Wilder said in the blue SD manual " all twang and no soup....just like a real PAF" In anything but a Les Paul , that Jazz is gonna be BBBBRRRRIIIIGGGGHHHTTT.....ear piercing bright. I had one in an LP & I thought it was bright...some people like it. How old is that neck pup? Before you do anything try sending it back to DiMarzio & get an Air Norton. I think those are the best neck pups I have ever heard & are the only Dimarzio that I actually like. The description says it best.....really hot(for a neck) & really clean. John Petrucci uses them & they sound f-in magnifico. I had a JB & an Air Norton & the A-Norton was slightly louder that the JB so I went to the recommended Tone Zone & immediately switched back to the JB(which has wonderful tone compared to the "no" Tone Zone)....but I thought the unbalancedness was cool as a neck lead boost....VERY COOL. I love just about everything by SD & don't like anything by DiMarzio.....but SD has yet to make a neck pup like the Air Norton....which is my absoulute fave.....and a high recommendation for your style of music.