We hope to have a slow-turn-on modification for Paramounts in a few weeks, which (again, I hope!) will let them use the EMLs. I have some other plans as well, for later in the year, that could result in a new Paramour power supply with DC filament power.
The hiss problem strikes me as rather odd, however. In a low-gain power amp, I would not normally expect it to be audible, especially on average or low-sensitivity headphones. That leads me to wonder whether it might be upstream from the power amps. Can you install shorting RCA plugs in the Paramours and listen for hum and noise? If you still hear it, is it tilted to the treble (sibilant) or bass (more of a rushing sound)? If you have an FM tuner, the interstation hiss is a reliable reference for a random noise spectrum; it's Gaussian (hissy) up to about 2kHz, then more of a rush in the treble.