Doesn't matter to me, its your car. Use your own judgment. Go with whatever you want, but an extra 100 ft lbs (181 to 280) doesn't sound like a great idea. The higher you go, the more that its going to stretch, and that is going to cause damage if its not designed for that load. Also, reusing axle nuts when trying to solve a problem like this is a bad idea, they deform also. There are probably reasons that people have to go over the 220 spec, and they probably have to do with either hub/axle wear or part deformation.