After reading lots of comments in the forum about growing lychees in pots and ground, I have a doubt about when to pass my two lychees remaining in pots into the ground. I already planted in June a Kaimana and a Wae Chee. They both suffered some burning/drying in the new flushes that they developed when were already in ground, due to too much sun and the stress from planting (they passed from a greenhouse to unfiltered sun at the same time). So I decided to keep my two other recent bought lychees (FZS and Salathiel) in their pots, placed in the north side of my garden, where they receive shadow until 5:30 PM and a shower from watering grass system every 48 hours. They are obviously happier there than the other two already in the ground in the western side, where is hotter and drier (anyway these two are dealing pretty well too, given that is their first summer into the ground, Kaimana, which enjoys wind and now also sun protection, finally developed big, green leaves with not burn tips).
So the question is that summer keeps going on, soon will come the fall, and I must take a decision regarding my two lychees in pots. Leaving them in the north side of the garden is not an option, wind, cold and total lack of direct sunlight during winter doesn't sound like the best setting for lychees. My doubt is if I should plant them now along with the other two lychees in the western side of the garden (they would have there shading meshes and shadow from trees, that will be remove as lychees grow) or would be better to keep them in pots and wait until next spring, having them indoors or in a south spot during winter.
These are the two trees (bought them in July, both developed new flushes almost intermediately after, and they are still growing/hardening these flushes):
Salathiel

Fay Zee Shiu

In the pictures it's impossible to see, but pots are typical tall pots for young trees, 14 inches tall and 6 inches wide (about 3 gallons).