Update Sep 23, 2018
Kaimana, No Mai Tze have pushed on Lychee rootstock as well. Now next would be to study growth habbit and pace of growth on longan vs. lychee grafts, all grafted same day. Note that longan and lychee stocks are planted 8 feet apart and get same sun/water/fertilizer, maintaining same conditions.
Good thing going now is subtle temps where we hit 90 with 30% humidity and then cool off at nights. both longan and lychees are in decent growth cycle and that is helping the grafts to take so quickly, under 10 days from grafting.