I'm no suspension guru but I've fiddled with the NSX suspension for 15yrs. If that was my setup, I'd run a much much longer main spring and still use that helper. In any case, you guys seem to like the setup so I'm sure it's well tested. Maybe if I get really bored i'll buy a set and play with the setup. I probably would want to configure the max droop I want (affects rebound like you guys are saying) but use the bottom bracket to adjust the ride height for corner weights and rake.
Maybe I should ask Heath if they can do this in a TTX 3 way setup. I've had the TTX in other cars (and my current MTB) and I love them. The DFV in the S2000 was trash though because the rear travel was so short.