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Regarding the 944 MC: I did a lot of hard thinking why the rears gave so little brake force, even with the 23/19 cups.
My conclusion at the moment is that maybe, just maybe, with the brembo alu calipers, the travel is less than on a floating-caliper with a 53mm cup as the older 944's had. That would mean that the fronts already have full contact while the rears have not fully engaged because the rear 19mm cup just isn't pushed any further in the MC...
Its also means that you just can't use the MC cup sizes to 'adjust' your bias! The MC cup sizes are there only to level out the travel of the cups in the MC, so its equels both front and rear to give the same travel/force.
Hope this explaining of mine makes any sense.
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Wally,
Do you have a proportioning valve installed? I've got one on my rally car, for solving different issues, but it strikes me that it would be appropriate for solving your brake issues. Mind you, you're also at a stage where a full dual-master/balancing bar would be appropriate as well!
I put a lever-style prop-valve in the rally car, though you would probably find a rotating knob style (Wilwood) would suit you fine. I suspect you'll balance out the brakes the way you want them and then leave it, as opposed to the rally car which gets changed as the road conditions change. I've done the rotating knob style mounted outside of the passenger compartment in other vehicles, as they aren't adjusted 'once set'. In your case I would think you'd need to install it on your front lines, as opposed to the rear which is typically the case.
-Dave