I run about 30psi in the bridgestone front on my 75.
When I had the pirelli rear I used to run that at about 35/36 and put it up to 40-42 if I was doing sustained 'high' speed, but the mitas seems to like it around 28-30.
For me, the tyre pressure depends on use/riding style etc. and any recommendations are just a starting point - although to be fair sometimes that starting point ends up being the finishing point too...