Jim, on the Compass 26 x 1.75's: These tires, and the various related Grand Bois options, have a good rep among the guys at my local shop, Tall Tree Cycles here in Ottawa. They regularly stock & sell Grand Bois tires. They're assembling my Thorn Raven just now, and I followed their advice to use 26 x 1.6 Marathon Supremes for the touring I'll do, mostly on tarmac. They said they'd had problems with the sidewalls on Panaselas, and reckoned the Supremes' durability would make them better suited to loaded touring than either the Panaselas or the Compass 1.75's. (They offered similar advice on the Schwalbe Marathon Racer 26 x 1.75's.) Thinking that I might want to try the Compass 1.75's at some point in the future, though, I have fitted fenders (mudguards) which will work with both the 1.6 Supremes and the Compass 1.75's.
For another perspective, you might look at Bike Touring News, written by Jim & Stacey Powers in Boise, Idaho -- they've done off-road touring with Grand Bois Hetre tires, and found them very reliable. Here's the link: biketouringnews.com