If you're not opposed to using RapidRooters this will give you at least 90% success rate.
Adjust the quantities for your situation.
Add 5 tsps. of kelp meal to 1 gallon of water. Let that sit for 24 hours and shake and strain & drain. This will be your base and you want to add 1/4 cup of aloe vera juice, gel, whatever term you use.
Soak the plugs for a few minutes in this tea and you won't be wasting anything because you can apply the excess to your mature plants.
Take the plugs and gently squeeze them - not to get them dry but to remove the excess water. You want damp but not like mud as far as water.
Put these in seedling trays that fit in a standard domed seedling tray. The goal is to avoid the leaves of one plant touching another and you want to avoid touching the inside of the dome.
When you take your cuts use a fresh single-edge razor blade. At the very least if you're using a used one then wipe it off with alcohol before taking your cuts.
Take your cuttings and soak them in the tea that you made for the plugs. Take a bamboo kabob stick and on the flat-end and not the point, turn your plugs upside down and make a new hole which will insure that the tea in the plug makes good contact with the cutting's shaft.
After you place the cuttings in the plugs then you want to spray the inside of the dome until you see the water beading-up. To the extent possible you want to maintain that moisture level. Don't spray the cuttings because it's a good way to introduce mold and other problems.
Put them under a shop-light if nothing else, The inexpensive T5 lights at Home Depot (around $50.00) are better but you'll do fine with shop-lights.
Both kelp meal and aloe vera juice contain the 3 main rooting compounds found in retail products but of course they're synthetic versions and this will be straight from the plant - salicylic acid (SA), indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) which are probably in the rooting compound you have.
The one that you will find in retail products that is not part of this is Naphthalene Acetic Acid (NAA) which is also used as a pesticide approved by EPA, i.e. it's a registered agricultural-grade pesticide.