Pressing rosin from a 28 percent strain does not guarantee a better return than a 22 percent one, since press yield depends on trichome head size and how easily the resin separates, not on cannabinoid content. Some lines with modest THC give back 25 percent of their weight as rosin, while high THC plants can smear and yield poorly. The wash and press ratings shown next to certain THC seeds on https://potentthcseeds.com are a separate score from potency for that reason. Pick for the product you plan to make.