They will grow as tall as the genetics, veg time and process/stresses, optimized conditions for pheno type, all play a part in how much she wants to stretch in phase. Typically, they already have a set height they want to be, the question is did you do everything right to get optimal height given all the factors.
50% is not a rule it’s just an average number. 50%+ is from optimal conditions.
You could force a stunted growth if you wanted to by making a condition not optimal. But you’d just sacrifice yield, quality and potency.