OP here.
Well I really don't think a couple lb difference is any big deal either.
What got me thinking about it was that I had a blowout on an inside rear the day before.
Two year old Michelin Load class E. The Michelin dealer judged it a 'defective' tire and I got a new one for $35 pro-rated.
All tires were set that morning for proper pressure.
Like I said, I don't think the different pressures were/is a problem, it's just that blowouts get your mind to thinking about stuff and wanted to know what you guys thought about it. :)