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I only grow autos and I would never even THINK about topping them... You've got such a finite space of time in which your plant can "do it's thing" - if you stress them out as much as topping would stress them out, you're not going to have good results unless you are an EXPERT grower. The most I've done is LST (with one HST which was an accident)... Autoflowers are pre-programmed... let them do their thing in their own time... Your grow looks absolutely stunning - don't mess with success! 😊
If your auto is a beast and gets to a decent size before preflower kicks in top away i say, if its small n hits preflower dont bother you'll stun the rest of its growth.
Thats my thoughts. Hope it helps
Cheers