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Heres some interesting info i found about the relationship between ABS module's modulating of brake fluid pressure and the amount of pressure/torque that is applied and released for a given rotor size and caliper combination.
It's kind of long-winded, but talks about some issues that may arise when upgrading to larger brakes with the same ABS module. Not trying to rain on anyone's parade, just thought it had some relevant info to your conversion.