I've had near 100% success rates for years by cloning in mini hempy cups filled with perilite. I start with 12oz Styrofoam cups with a hole punched in them a inch or so from the bottom and place them in one of those short long clear storage totes. The tote acts as a tray to catch the excess water when you water the hempys and I usually use 2 trays and move them from one to the other after watering them to drain the trays more easily. No humidity dome, no heating mat, no additives or hormones just plain perlite and bottled water. I use the same mini hempy cups to start seeds in perlite seems to be a good substrate for plants to start in and cuts down on dampening off occurrences. For clones the tip rests just above the level of the drain hole and seedlings get buried a little over a inch.
This what I do. Except 12 oz. cups I use the little Solo shot glasses with holes drilled through the bottom.
Those sit in a plug tray sitting in a regular tray filled with RO water that sits on a heating mat set for 80*F.
If the cuttings remain turgid for 48 hours, they'll grow roots.
ETA- I just pulled all of my clones out after 10 days. I took 4 cuttings off of 7 plants for 28 cuttings. 5 of them went limp in 48 hours and were culled. The remaining 23 have at least 1 inch roots (1 was a bit stunted for some reason) if not 6-7 inch long roots (the vast majority of the remaining cuttings).
Since I am only saving one clone from each plant, one of the remaining clones have been placed back into the cloner for the next 4-5 days to ensure the planted ones survive, the rest went into an extra bed I have in the flowering room. (Normally I will veg a clone for at least 14 days. These went straight into 12/12 just to see how they'll do.)