Canna , what are you utilisng for cloning? If you haven't already tried it then perhaps you might want to try Dip-n-Grow or the Woods Rooting compound , much better success with larger woodier cuttings. I've cloned many a fruit tree cutting etc using the 10 to 1 dilution , use 20-1 for these , if extraordinarily woody try 15 to 1. A 2 oz bottle of Dip-n-Gro is good for roughly 2k cuttings at 20 to 1 , though reality is with waste factors it's more like half that , still they are the most economical and best performing on the market , and I've tried 'em all.

Drop me a p.m. if you would be so kind as to where there's a good ongoing grafting discussion. I'm about to attempt it with cannabis , been doing it for quite some time with fruit trees. Kudos to you and highly informative.