Brake Master Cylinder Sizes With Pedal Box

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OK, I started with some searching but did not find an answer to the specific question.

I run a HR31 track car, currently using the stock HR31 brake master cylinder and booster. The front brakes are R33 GT-R brembos and the rears are stock R33 GTS-T/GT-R ones.

My pedal is too soft and sensitive for my liking and there is not enough rear bias. The two options are to fiddle around with a Patrol master cylinder and bias valve or just go the whole hog with a pedal box and twin masters on a bias bar. My preferred option is the pedal box and I am looking at the Tilton 600 series alloy one.

The question, is there anyone in the SAU community running a pedal box in a 33 GT-R with Brembos? If so, what size master cylinders are you using? I am looking for moderately high pedal effort to make them work as one of the things I like least is a soft pedal. My system shoudl be close enough to the GT-R original that I should be able to get enough rearward bias even with the smaller rears I am currently running (The Brembo upgrade is on the cards for the rear too, I am keeping my eye out for a pair of calipers at the right price)