what kills a turbo though is the speed. 29 psi in the mid range does not mean that the turbo is spinning faster than 22psi at the top end

becuase the engine cannot consume as much air in the mid range, the compressor does not have to work as hard to supply it with that level of boost. after all, the boost is basically just supplying the engine with more air than it can handle to stuff it into the cylinders harder to try and fill them more.