While ready reviews on the Boone, the articles mentioned that a 700x32 is standard with about 10mm clearance on each side. You rims are tubeless ready. I'd suggest the 700x36 Clement MSO. This tire will give you increased volume and excellent traction on gravel. It's moderately fast rolling on pavement, better than most other gravel tires. Run these tires tubeless. I've participated in the Rocheport Roubaix, the Red Dog Gravel race out of Jefferson City, and the Cuba Gravel Crisis in the Ozarks. I have seen numerous participants with flat tires. This is almost always caused by using tubes and pinch flating. Missouri Gravel can be soft and often includes an uneven substrate.
I have done all of those same races and, one in Georgia and a lot of grinding in Alabama on some pretty knarly rock/gravel and even some sandy stuff - my Maxxis Ramblers (tubeless) in 40 ran amazing over this wide variety of terrain - they even shed muck pretty well too (some of that Alabama/Georgia moon dust clay/mud). Obviously these may not be an option if a bike doesn't allow 40's but I have been very impressed with their utility in many conditions - they also roll pretty damn well as I have been up to around 40mph on them (paved road) on the Femme Osage route. I switched them out for the WTB Resolute - which is an amazing tire, but they ballooned out to nearly 45mm and any much on the side knobs rubs the chain stays on my old Eddie Merckx Cross bike. The Resolute and the Rambler are very similar in tread design - I would go with the Resolute if they would fit just because the are a bit tougher and wider. But I still love the Rambler - probably what I will go back to and hope they will perform well at Land Run (50) this year - conditions depending of course. If it is wet, I may go to a mud specific tire like the GK Mud or something similar.