As far as I know the Classic Plus has an Alnico2 magnet and is just a slight hotter 57 Classic. I replaced the 57 Classics in a LP I used to have for the same reason: too shrill.
MCP Nasty Nasty or Detroiter. These are both very similar as far as their eq curve goes. Go with the Nasty if you want a touch more heat and tightness, though, it can be too tight in the wrong guitar. Each is in the PAF category as far as output goes, but have a bit more oomph. They have a bit of a bump in the lowmids, so they're beefier than the typical PAF. Their top end is I've run across in a pickup - it cuts through, but no shrillness to be found. Both have that lower output openness. Both are killer pickups.