FWIW I'm using this for my tire pressures:
http://www.michelinrvtires.com/reference-materials/load-and-inflation-tables/#/
I can't find the load table for my Michelin MS/2's, but I've been told I can use the load table for the Ribs in its place so long as its the same size tire (225/75/R16).
Given the chart, I could probably safely drop my front tires down to 65 - I've never heard anybody getting their front axle up to max GAWR in a long Class C. I wonder if that would help too?
I know, I have to get it weighed, but if I can get in the ballpark I'm fine being a little firmer in the psi department.