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Foliar feeds are good for cloning because the plant can still take up nutes in that way making cloning faster though I have always used great white mycrozime or something to clone just dip it in that in rock wool or soil and you root every clone you take its great stuff :)
I think you can put some rooting products on the rhizomes, cut some leaves to reduce their photosynthesis, so that the rhizomes will grow faster, pay attention to maintaining humidity.