I top auto's all the time (but only once), as long as they're growing well, it doesn't do any harm. I average 4-6 oz. bud/plant. After you top them them, LST them, epecially if you're tight on vertical growth space.
Guyss I broke one of the top branches after toping while doing lst, I did a small recovery till I get electric tape or something will it work or the branch is dead anyways? Should i take it off?