Were they bare root or in pots when you got them? Did they have leaves when you got them? If they leafed out in the sun, I would guess it's not too much sunlight. If they had leaves when you got them, they may be sensitive to the sun, depending on the conditions at One Green World.

I bought a potted paw paw from One Green World several years ago. I planted it in the ground after a few days, in a sunny spot, and it was OK. I recall the potting mix was mostly pine bark, but the mix you made should be OK.

Alex

These were potted plants and already leafed out. Will they recover? Should I give them more shade?

How tall are they? Pawpaws cannot tolerate direct sunlight for the first year or so. If they're under about 2 feet tall, you should keep them in shade at all times.