The other way to increase yields, and the one I prefer, is to use stakes and tie wire to spread the plant out. Note that you can combine this with judicious tip pinching if you want, but don't overdo it.
If you bend the plant's main stem over and then tie out every large branch, it has the effect of opening the center of the plant to sunlight and airflow, reducing pests and pathogens. It also means that every little side branch will now turn and grow vertically and, since it's exposed to light, form a nice little "nug" of a bud at harvest.
In the photo, I've taken one of our plants and tied it out like I would do if I were planting it in my garden right now. (It's just for demo purposes! Never leave them in the small grow bags!)
In a few days, all the growing tips will turn vertical and continue growing. Eventually, new stakes can be added and these branches can be staked out.
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