I have no idea what constitutes "a wider rim" but the claims sure sound like kool aid. 62 psi in a 28 mm is decidedly soft. I cant imagine its all of sudden not soft because you widen the rim a few mm. Why would you even go there and add a bunch of rolling resistance.
if you are 164 why deviate from the recommended 67 psi. Afraid of a pinch flat? ;-)