PJS50. I don't know which dual disc setup you have but if you set it up right and broke it in correctly,if this clutch is a Mcleod will hold 900 hp without any slipping. Yes you can use a steel disc on the street as long as the center hub is spring loaded to keep the shock to the drive train to a min. If you are running a solid disc you are beating the hell out of the rear gears.
You have to guys on this forum running over 700 hp and torque to the wheels, not the flywheel running 11" street twins without any slipping or problems. You have to setup a Mcleod like the 13 page info tells and breakin the clutch for min of 500 miles, if you don't the clutch will slip. If the air gaps are not set right, the clutch will slip, if the adjuster to the pressure plate are not readjusted after the 500 mile breakin the clutch will slip or scatter. There is no weak side of the clutch,
same pressure is applied to both sides of the disc.
some discs are made from different materials on each side for certain driving conditions. The same info applies to a soft-loc clutch with breakin and running except there is alot more adjustments for this setup. I couple of the guys at R&G are running tilton clutches with 2 and 3 disc setup, except for the noise with the car at idle there are no problems and 200+ hard road course miles but on the cars. You can't ride this clutch though, in or out on the pedal. I am running a street twin on my next motor,498 with a little more power, I see no problem if it is setup and broken in right. Time will tell.
PJ I do like your new theory on different pressures on each side of the disc. Rick L.