you must be one of the lucky ones, I know quite a few of people on diferent makes and models who have had power steering issues with larger tyres.
I only have the issues on the 35's off road and its better with the cooler, but it stalls usually when I'm in a rut or something, on the vid of me doing little red I paused slightly just after I changed my line at the bottom of the hill that was because I had no steering