I usually let the tops you tied down grow out some, and when the main shoot stretches for apical dominance I'll tie it over changing the flow of hormones and all of those tied down girls will fight to be the main cola, allowing you to have multiple tops if you control them. Once they're all fighting for it let them stretch for the light as your plant isn't far from flower. You'll end up with multiple colas instead of one. Hope that made sense, I'm super stoned at the moment.
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