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A bigger positive number for offset means more room for the caliper and a wider track. It can also mean the centerline of the wheel is not in the right place in relation to the wheel bearing and create a constant side load on it that will seriously shorten its service life.
Your suppositions about brakes are dead on the money. I would prefer you had prior experience with larger rotors. It's easy to screw up a brake system by using the wrong master cylinder diameter to caliper piston ratio combined with larger diameter discs. One of the cool things about larger diameter discs is they don't need as much swept area to create torque, which is similar to the concept you described as needing less pressure. Since there are a dozen or so variables to work with, it may take some trial and error to find pads that work, and possibly a master cylinder change to make the brakes sufficiently sensitive and still provide the stopping power you want. Of course, that's really just a matter of experimentation and cubic dollars to swap out parts until you get it right.
Good luck with the new setup, and I hope you don't have rotor cracking issues. It doesn't sound like you plan to do track days with the car, so that will help, but I'm not a big fan of drilled rotors at all. I've seen too many with cracks after a single track session.
Your suppositions about brakes are dead on the money. I would prefer you had prior experience with larger rotors. It's easy to screw up a brake system by using the wrong master cylinder diameter to caliper piston ratio combined with larger diameter discs. One of the cool things about larger diameter discs is they don't need as much swept area to create torque, which is similar to the concept you described as needing less pressure. Since there are a dozen or so variables to work with, it may take some trial and error to find pads that work, and possibly a master cylinder change to make the brakes sufficiently sensitive and still provide the stopping power you want. Of course, that's really just a matter of experimentation and cubic dollars to swap out parts until you get it right.
Good luck with the new setup, and I hope you don't have rotor cracking issues. It doesn't sound like you plan to do track days with the car, so that will help, but I'm not a big fan of drilled rotors at all. I've seen too many with cracks after a single track session.
