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First, be very careful pressurizing your stock radiator, they are not designed for that and you could ballon your tanks, or worse yet bust a seam. There is a pressure valve available that keeps it to around 4lbs. that is available. (someone can chime in with where they are available, I know they are listed in the V8 Times).
I just wired a plastic bottle near the bottom of my grill to catch any overflow, I can pour it back in the radiator if necessary. My car like your runs cool and only pushes out coolant at higher speeds. My level normally runs below the top of the tubes, if I fill to top of tubes, coolant is being pushed out at lower speeds, and the car does not run any cooler with that extra coolant.