The root question is whether there is a way to upgrade the ABS algorithms to match your stickier tires and other brake upgrades.
We're all crashing on the rocks, here, because I don't think anyone here has ever tried it. Even the tech articles I've read from people like StopTech say that the "good" big brake makers try to tune their systems to the factory ABS systems. (See
article) Seems to me that if it were easy to do, these guys would tune the ABS to match their big brake systems, which would give them more freedom to design calipers, pistons, etc. without compensating with a smaller master cylinder.
The simple answer is, for street use, the brakes are damm good. If you want to really zoop up your brake system without screwing up the ABS, the only answer may be to disconnect the ABS.