Sam, where is the trans temp taken, Outlet line to cooler? in the Pan? it makes a difference in the temp of course. On our last Dodge an 03(3500) with a mild upgrade the temps were IIRC a lot higher, trans going down the road 170's, EGTs climbing the Siskiyus I had to back off to get the EGTs below 1200, and boost would run somewhere around 22 pounds.
So it sounds like your doing fine with those temps, although Clear Lake to Redding is not very mountainous IIRC?? Try Clear Lake to Salem Or for some hills LOL
Good Luck and have fun on your trip:)