I see I'm a bit too late on this one, but here's my two cents if the ceramic warpig is too much. With a brighter guitar usually an Alnico 5 will warm up the response while increasing the bottom end and rounding out the tone. I can usually get a really tight palm mute even with alnico 5, it just depends on the scale of the guitar and the voicing of the pickups. I have a set of Bill n' becky L500's in a PRS SE Custom 24 that can handle any style almost :D Shorter scale guitars like Les Pauls, for instance, have a mushier feel than a longer scale like PRS, strat style or Baritone
However, if you are using a lower tuning through a Mesa, the ceramic will be tighter like everyone else has said. The high end is usually brighter and a bit more raspy with a ceramic magnet, but will clean things up considerably on the low end. Having double screws will soften the high end on a pickup. (I had a few conversations on this with Suhr) and tends to smooth out the treble response on a pickup. Just some info I've picked up from people in the industry I've spoken with. Tim, like always, is a the best source on his products and you can always exchange them! Good luck!
