Hoang, I'll try to find the old picts, they were not that really big trees, I pruned them hard every year to keep them at around 4-6' tall including pot. I change the pots when I got them and have not since, I used fast drain mix 2 parts pine bark 1 part perlite and 1 part crushed lava rock and 1 part worm casting compost, similar to what they call gritty mix now a day, and just top it off with more mix and worm casting when the soil settled down every year, one thing that I have been practicing for quite a long time now is that all of my pots are drilled with quite a few holes to help with drainage and preventing root bound problem very similar to the commercially available air-pot, just imagine the plan old black plastic pot with 1/2" holes everywhere and cheap
I don't use any commercial fertilizer, just strictly worm casting from my vermicompost and compost tea once every 2 weeks.
I got the longan and a few others from Roger Meyer in SoCal and the lychee from one of the home grown private nursery also from SoCal (Craigslist), next on my shopping list are mango trees, maybe get some when I visit SoCal next month, are they expensive?