I had a similar results. 10 cuttings from one source and 30 from a local branch. 8 of the 10 rooted and budded. 2 of the 30 took root very slow and late. I tried over the summer several times 30-40 total almost all died I took 6 that seemed to be alive but no roots, applied clone X all rooted and buded. 2 are behind the others. the forum cautions that excess hormone slows leaf formation, maybe the 2 that are behind in leaf.
Bill z7 Baltimore, Md.