I have experienced Hornbeam , without sealing the trunk cut site, throwing base suckers. With that said, I have and experimental collecting sites, where I've bought and applied the different hormone powders at different locations on trunks, with sealed trunk cut sites, to learn and see if I can't find a working combination. This could take years! There are a number of hormones used that can and do offer different results then just using root dips. I do use the black bag/soil heating once collected and yet SOME trees no matter the roots collected will still only grow from the base. Have our collected deciduous trees grow close to the tops is worth everything in the long run.
I never post, I'm just a reader but I will try and reply once I get some kind of reliable results.