I have Juin Tech GT-P-4s on 2 bikes. I weight about 95kgs. I find that on long steep descents I have to brake a lot and have had the mineral oil in them expand/boil and at first, drag on the rotors, then completely lock up. It has taken some experimentation adjusting the clearance between the rotor and pads, so that when they heat up they don't drag on the rotor. I use regular old Shimano brake cables and housing, and they don't flex too much.
I believe that your rotor and pad selection will be more important than the cables. If I upgrade or do it again, at my weight, I will go with 200s in front and 180s in back. Currently I run 180s front and 160s in back, and am still playing around with rotors that dissipate heat better, and still worry about how good they slow me down or stop the bike.