The Warm-N-Dri spec calls out R5 for the 1-3/16" product, so that's about right.
With the slab supporting the full span from below you don't need 3/4" OSB to handle the floor loading- 5/8" is fine (even 7/16 sheathing can work.) The heavier OSB subflooring is only necessary for supporting spans between joists. Columbus is in US zone 5, and at your subsoil temps the additional R of going to 1" (or even 1.5") is cost effective in the longer term even assuming heat-pump or natural gas heating costs. Even 1" of XPS is more than enough capillary break and vapor retarder against ground moisture, and will keep the subfloor above the dew point of the summertime air as long as you keep the basement under 60% relative humidity (which will take either an air-conditioned house or a basement dehumidifier in a Columbus OH climate), even with the insulative effects of carpeting or cork flooring.
On the walls, yes, the exterior R counts, but so does the capacity of a CMU wall to wick ground moisture up from the footing. If there is a membrane or metal capillary break between the foundation & foundation-sill you can put foam of any permeance on the wall and it will be fine, but if it's a thin foamy-thing or none at all it's better to use a higher-perm foam than 1" XPS. From the point of view of keeping the stud edges dry in winter you'd have plenty of foam-R with an inch of XPS, but 1.5" of unfaced EPS (R6) would have similar R, but provide 3-5x the drying capacity for the CMU to better protect the foundation sill. (It may even be cheaper.) Tapes don't seal EPS very well, but low expansion foam does, as does fiber-reinforced duct-mastic applied with a putty knife 1/8-1/4" (initial thickness), ~1" either side of the seams.
Run the floor XPS all the way the CMU, put the edge of the wall-foam on top of that, and run the subfloor all the way to the wall foam, and the bottom plate of the studwall atop the subfloor. That way both the studwall plate and subfloor edge has full capillary & thermal breaks from the CMU & slab.
Yes for 2" XPS foam-sealed on the band joist and sill, sealing it to the top of the wall-foam.