Dude, I was totally where you are at right now. Cover band doing Rufus Tell Me Something Good thru Franz Ferdinand Take Me Out. My main guitar is a LP Classic, and the 1st pickup to replace the 500T was a JB. I dug it for a long time, and it still has my favorite lead tone of any SD humbuckers I have tried. But eventually the relative loosenes of the low end had me looking for something else.
The Custom gives nice tight power on low string riffage, and killer crunch on chords. But I found the lead tone a little stiff, and the tone could get a little brittle on higher notes (like the part before the verses on Take Me Out
|------------------------------|---------------------------------||
|--8---------------------------|--7-7-7-7-7-7-7-7-7-7-----------o||
|------9---9p7-----7---9------|----------------------7-7-7-7----||
|--------------9---------------|---------------------------------||
|------------------------------|--------------------------------o||
|------------------------------|---------------------------------||)
I swapped the creamic mag in the Custom for an a5 to make it a Custom5 (SH-14). While it doesn't have the same juicy lead tone as the JB (and I am the lead player in my band), or the killer chord crunch of the Custom, it solved the low end looseness of the JB needed for the more modern songs, and the a5 smooths out the ceramic stiff/brittle thing of the Custom, and leaves you with a nicer clean tone too. I didn't like it as much the 1st time I tried when I was playing mainly thru the 6L6 Boogie amp, but now that I am just bringing the EL34 combo amp to gigs I really dig it. Or at least it is the best compromise I have found for my cover band gigs.