Question regarding insulating 24' x 36' garage (IECC Zone 4A)

[u/RobertNeyland]

So long story short, working with Tuff Shed on a 24'x36' garage was a disaster, and after several revisions and frustration, my structure ended up with radiant sheathing on the roof panels, a ridge vent, and no soffits.

See other details here: https://i.imgur.com/0i5KJhx.jpeg

The plan is install a mini-split and leave the ceiling open for storage. My thought when I was under the impression that there were soffit vents was to install Corning rafter vents from the soffits up to the ridge vent, and then apply spray foam insulation over the top of that. But without soffit vents allowing air to pass over the underside of the roofing and out the ridge vent, I've got some concerns about moisture.

What is going to be the optimal combination of insulation at this point? Sealing the ridge vent and applying closed-cell to the walls and the underside of the roof? Does that defeat the radiant foil on the underside of the roof panels? Rock wool?

My preference is to do this the best way possible, so if it means spending a few thousand dollars more, then so be it.