The torque bias is always 35/65 for the 04/05 STI center diff(a little less on the later ones). That's set by the diffs gearing, no changing that with any controller. DCCD is just controlling the lockup of the clutch in the diff. Fully open it can seem a lot more rear biased than 65% since it's easy to get the rear tires to break traction. Once that happens most of the engines power would be sent through the open center diff to just spin the rear wheels faster. With the rear tires spinning traction is low, so the amount of torque actually being transmitted through the center diff is also relatively low. 35% of that relatively low amount of torque going through the center diff is still going to the front and depending on how little traction the rear end has, may not be enough to actually turn the front wheels. Fully locked, the diff is still sending 35/65 fr/r until one side starts losing traction then the locked up clutch in the diff will transmit torque back to the side with more traction.