G'day Lurch,
yes! I had to get the rear stay, that goes into the fork crown hole, moved.
The Ogre has suspension corrected forks which the Hunter Pass Rack (Velo Orange) isn't designed for.
I didn't know this when I ordered it and it cost me more than the purchase price to get it done as I'm new to my area and didn't know a friendly stainless wielder.
If I was buying again, I'd be likely steering toward their other version:
VO Randonneur Front Rack - Racks - Racks & Decaleurs - Accessories
I believe this could be made to work without cutting and pasting

As for tires, I'm currently running 2 inch wide Schwalbe Mondials in 50-622 at approx 40 psi (as per the above photo).
If the touring is pure tarmac I run 2 inch Schwalbe Supremes in 50-622 but would consider something skinnier down to about 35-622
For around town commuting I utilise a fatter Schwalbe Big Apple of 2.35 inch or 60-622.