I clone by using the standard 6x12 inch trays with that 8" tall dome. I make a ph5 mixture of phosphoric acid (ph down), superthrive, Advanced 3 part .4 ml/ L and Olivea's Cloning solution. I soak the rockwool in this solution then toss the water out, but I try to make just enough fluid for the rockwool to suck up. I take a cutting then put it directly in Dutch Master Replicator and then into the cubes. I place the cubes into the dome and let it sit in darkness for a day then under 2 40W CFLs. I then water at least once a day when I can.They root within a week and stay nice and healthy.
One time I left the dome off on some clones that were only 1 week old and they all wilted and most of them are sick and damaged. Also never use urine to drop the pH in a solution for clones, I will not tell you why but just trust me on this one.