Invest in a nice clone tray holder, the part that holds the cubes in place, not the actual tray. Mine was like 13 bucks and it works great for getting stupid roots. Here’s my procedure that pretty much gives me 100% success and super nice white exploding roots.
500 ppm of
clonex, I presoak the cubes for 10 min first
Rooting gel on each clone before I plug them
Spray leaves and dome lid only as they dry out, for me that’s about once a day, I try to avoid spraying the cubes as they already have plenty of moisture retained from soaking and you don’t want them to get over soaked or they won’t root, I give mine I tiny squeeze to ge rid of excess water. Once they start rooting you just have to check each one and spray the blocks if they need it. After I get roots going I put water in the tray about a half inch or so below dither blocks so the roots will reach for the water, also at this point I usually stop spraying the blocks. Basically this way you can grow your roots out as long as you like once they hit the water, I’ve had 10” super healthy and white roots that were all tangled together from having to leave them chill in the tray an extra week
Dome on with both vents closed for the first 5-7 days or until roots have started growing out of the bottom. I only open the vents a quarter of the way each day to get them ready for the dome to come off, if I don’t do this and transition them slowly then some will die for sure.