The tender growth of young fresh citrus transpires water at a higher rate than does mature growth. Therefore, requires a higher and a more often supply of water available to them. Looking at the pictures that was posted, it looks like the medium is almost pure bark. Although it is probably a 5-1-1 blend. For new tender growth in 5-1-1 water, water water.

I take off all leaves and petioles from the scion, then wrap in Buddy Tape. You need to keep that scion hydrated.

I check it every day and pull of the top - full of moisture. Its 511 and quite a bit wetter down below than it looks atop.......the rootstock was happy I pulled off two other rootstock branches, may keep one. the calamondin has no leaves and 3 on the owari - I cut in half but I'll pull at least 2...

Its really humid here.....dog days