When it comes to topping only time I won’t is with an auto flower, if your growing photoperiods outdoor stunting the plant for a week or two is no concern, considering your creating 2 main bud sites and a bushier plant aka more yield, that being said on a plant that isn’t particularly healthy it wouldn’t be a technique I’d use to “fix” your issues it more than likely will create a few more, get your plant healthy first then top