Stretching too early can create thin, brittle stems that require staking. A good way is to start with a thick stem for the first 5-6 leaf sets by keeping the light closer and stronger, then topping or LST and pulling the light back to stretch her out. This way, you have a strong foundation that can support the long, bud-heavy canes you are seeking. I wouldn't recommend doing it in reverse unless you are going to ScroG, even then a fatter healthier stalk at the base delivers more nutrients, faster. Think of a pyramid shape for strength, not the other way round. I hope that helps.