make sure your cloner is clean i spray with the stuff alcohol and wash good.I use tap water no ph in 16 site cloner i use 15-30ml pg (the stuff homemade clear rez pool shock(calcium hypochlorite) with water mix 1 gram per gallon of water). use that mixture 15-30ml pg.I put 1-3 cuts per puck i use KLN 1ml in 2g cloner. cycle timer 15on 15 off. Always root in 7-9 days. if the water look funny or smell stink change the water and throw some stuff inside.
I have not made very many clones but do these look like they are going well? I'm surprised it's just a ball of roots and not longer roots shooting down like a lot of others I have seen.
I did that with the two other snips I rooted but this one is going in a hydro set up so I need longer roots before I can introduce her to the RDWC system.
I find it helps lightly scraping the outer layer of the base of the stem . I seem to get roots in half the time compared to if i didn't. Also helps to cut it so you have a node close to the bottom.
I've seen some great root boosting with myco. That's a great idea.
I think myco, veg nutes to the low ppm like is already said to 300-400ppm, oversaturated DO like in aeroponics, And using cloneX gel on the cutting is a killer way to get guaranteed success, given you follow good cloning practices to acquire said clone.