Neal, perhaps you could plant the F. meleagris just outside the rain shadow of the tree and the F. Persica closer to the crown, so to better provide them with their individual needs?
I believe full sun is usually recommended for F. persica, but some very light shade should be okay for you, as you have higher temperatures than us here in the cold north. I would be careful with too much shade though, and in that case I personally might look into a spot against a south facing wall under a roof overhang instead.
