also, maybe check your pH of your cloning solution.

4' from hid, 24" from 4' 4bulb T5, and off to the side.

cuttings like 90-95% humidity for first few days.

you meticulous in your movements, maybe the dome is all you need.

i use no fancy clone machine.
i do use a 6" tall dome, with vents at top. closed first day, barely crack vents next 3 days, open a bit more to about 25% open.

plain old tray with 50 slots for rapid rooter pods (tray, pods, and all can be had in one package, or once you have trays, buy only the pods). jiffy pucks work OK, but i like the rapid rooters mo' bettah. i use the 24 slots in the middle, and use the vacant slots to monitor water level. i rotate the tray every day, as those heat pads CAN be inconsistent and have heat spots.

i don't bother recutting, but i do place cutting in cloning solution while i trim leaves off, and cut remaining leaves in half.

i soak rapid root pods in same solution i put the cutting in, and use to keep the pods moist for 7-18 days. i employ a heating pad under the tray.

solution...
1 gallon distilled water, less a turkey baster full .
8 teaspoon Clonex rooting solution (not the gel)
1/2 drop of No Damp. (not absolutely needed)
drop or two of hydrogen peroxide.
1/4 teaspoon SuperThrive.
1/4 teaspoon Humboldt Roots.
1 tablespoon liquid seaweed.
pH down to 6.2.

Turn OFF any nearby fan! cuttings sensitive to wind.
-cut with razor blade.
-put in small glass, trim leaves.
-transfer to Clonex or B'Cuzz cloning gel (both good, i prefer clonex).
-"swish" around in gel for 20 seconds.
-place directly into tray pod slots, after removing DOME, and immediately replacing dome.
-when done, open dome, give a quick mist (i use water and small bit of liquid seaweed),
make sure there is water in bottom of tray (16oz), close dome, and mist them twice a day, whisper sweet nothings to them, mist them, and be patient.

keep them MOIST, not soggy. NEVER let get too dry, better to error on a bit too wet, than too dry.

in a week, they got roots, in two weeks, they usually ready to go into 4" pot with fox farm ocean forest.

THIS 4" pot, i place in a tray, and use a dome for next week or so, but no heat pad, and place them about 12" from T5. when plenty new growth evident, i move out of dome.

i find that i can keep them in these little pots for long time, if needed, but prefer to send them into bloom when 12" tall, and healthy. i have x-ferred them into 3 gal pots the day i move them into bloom, and i have waited, also, to x-plant to 3 gal, and let them veg a while. either under the T5, or a 400halide, or both (rotate).

noteworthy...
some types/strains take longer to root.
i have an old indica (medicine)that roots fast.
i have a different type(recreational) that takes longer.
i have played with some strains that it isn't worth the aggravation to even try to clone them. but im still a novice, and always learning.