Somali Ghost Train regular

Same challenges as I've seen several times now while using EazyPlugs. They root too little too slowly, even though pH is correct at 5.8, temp. and humidity are maintained stable at 22 degrees and 80-90% RH. The only mistake I can think of is that I perhaps left too much leaf on the cuttings... The first roots outside the cubes appeared after 8 days . As soon as seven days have passed the clones lose their vigour and they get a difficult time after being transplanted to the pots. I had to replace half of them a day after because they simply had no visible roots outside the cube. Watered on D5 (today). They will get a few days to start growing otherwise I'll start over with new clones...