You may want to start by just replacing the capacitor that came with the guitar. im going to assume its a ceramic; just cut to the chase and pick up a Sprague Orange drop cap. Get one the same value thats in there, and one higher or lower. Start there. For a few dollars, you may find that all it needed was a new cap. Also look at the pot values. Im (again going to assume) it has 500K, though older guitars with PAF's have 300K alot in them. The higher the value, the more output, and the more high end and cut it will have. If you want more cut, and it has a 500K, get a 1 Meg, if you want it warmer, and it has a 500K, put in a 250 or 300K. You can mix and match to; 1meg for the bridge, 500k for the neck.
Yeah, Im pretty cynical when it come to pickups, and I kind of turned away from Fralins for some unreasonable reason, the same way I do with Taylor acoustics. There was never anything wrong with them, the Taylors i just found too..... perfect built. I know its weird, but sometimes I like small imperfections. Plus I would never spend $2500 for an acoustic with a bolt on neck (sorry Taylor), that's why I stick with Martin and Gibson (though I bought one of the Epiphone Masterbult Mahoganay dreadnaughts. I wanted a gutiar I could carry in a gig bag without worring about it hitting something and getting damaged. It cost like $500, which for the tone, material, and playability was a friggin bargin; solid wood, and, unbelievable for the pricepoint, a dovetail neck joint, (they messed up on my shipping royaly, I ended up getting it, for half off, plus 40% off the next guitar. The only complaint with it; its a 'non servicable' guitar, meaning its disposable. They use epoxy instead of glue, so if you need a neck reset, your just out of luck theres no way to break the bond like you do with steam on glue.
Im off track though. I installed tons of Fralins, the shop I work out of was an exclusive Fralin dealer, so I tried them all. They all sounded great but noting grabbed me. After exhausting all the pickups I could find for a guitar, i tried the Pure PAF's, and that was it. I put them, with varying outputs and winds, on all my humbucker guitars.
But on one guitar; a PRS 25th Anniversary Custom 24 SE(yes the Korean made, but well made, great platform for hotrodding), I put them on. While they sounded ten times better than the stock pickups, they didnt floor me. I hadnt replaced the pots yet, I had ordered some Bourns low-friction, and they werent in yet. So i had the stock ones. I had it opened and saw the cheap capacitor on it. I didnt want to wait for the new pots, I put in a Mallory I had laying around. AND IT HAPPEND! The whole guitar just opened right up. I didnt even go for a different value, same value, just made with a different material. A $7 capacitor, thats all it took.
So try a different cap first. And like the other poster said, try to figure out what you want and expect out of the next pickup.