I agree with that for the most part, but have enough experience (35 yrs) to know how much is too much when it comes to brake improvements.
While adding a better pad is the first step in getting the brakes to perform to a higher standard, a moderately larger rotor will be of even more help without upsetting the bias the engineers built into the car. Going from 280 to 300mm isn't that big a change that it will upset the apple cart, but will give better fade resistance and longer pad life.
I'm pretty sure the caliper brackets will fit the stock calipers, so there won't any change in the clamping force or pedal feel, travel, etc. If they don't then I'll make some brackets for the Wilwoods and use them.