Thumbs up on the damping.
Jeffseight, I don't think GR Research offer a crossover upgrade for the CW4s, only the Forte 3s from the Heritage line. If he does offer it, it's not on his sight that I can see.
For those using solid state amps, the Western Electric or Deulund DCA tinned- copper speaker cable works well with these speakers, helps take away the hardness or smooths things out a bit. Either 12GA or 16. 12GA is going to probably be richer/warmer.