When you say the prop valve is backed all the way off, you mean dialed all the way in right? All the way in (clockwise) is the minimum pressure reduction...all the way (counter clockwise) out is the maximum. A quick pressure check front and rear would confirm this if you have a brake pressure gauge.
As for your brake bias, it's important to note that your front D52 calipers have ~6.7 square inches of piston area, approximately 30% more piston area than the OE S10 Blazer calipers with twin-46mm pistons (~5.15 square inches), so assuming you don't want to change the components being used, then your best option to increase the rear brake torque may be to run a higher CoF pad in the rear. Alternatively, you could run a lower CoF pad compound up front and achieve essentially the same effect, albeit with more pedal effort required to achieve lockup, although that's not typically an issue with hydroboost, especially installed with a manual pedal ratio and arguably small MC bore size for your given components.
Tobin
KORE3
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