My limited (or lack of) understanding is that the plant will push auxin uninterrupted until it gets to an apical bud, or if none exist, the last node of the pruned branch. The last node and possibly one or two prior will swell and fight for apical dominance.
Notching and/or various pastes can help to push growth from other nodes, though notching hasn’t worked for me. I’m in a similar predicament where I have one shoot rapidly growing and outcompeting nodes further down branch that are just starting to push and leaf out.