I'm building a 29er and live in a flat area, Austin and I'm recreational rider. Are the new XT 4 piston brakes overkill? I have 180mm rotors in front with XT 2 piston on my 26er and I feel they work well. When I had 160 in front I didn't think it was enough. Should I go with 4 piston or just with 200 front rotors?