I bet the best way to do this is to paint on a lil gel and wait a few days, then clone as normal. Not waiting for swelling or nubs. I also hypothesize that if you make a slit into the branch before applying the gel may get you good results too. IDK. Gotta let the mums grow for a few weeks before anything else is done.
I agree, I did this on some extra clones and waited a really long time before chopping. But the Root Tech was too strong anyhow. I get clones to root fast anyhow, but light coat and not waiting too long might have better results than waiting. The store bought gel is stronger, so I think using less and cloning sooner is a good idea as well.