Hey there CoolassNinja, basically it's not the stretch that causes decreases in yield but it's the causes of the stretch that causes decreases in yield. For example plants stretch because of lack of light, lack of light , lack of yield. plants stretch because of heat and other environmental conditions , poor environmental conditions decrease yield. On the other hand some folks intentionally cause a stretch at the very beginning on purpose then dial everything in, they end up with bigger easier to manage (for them!) plants. In your case the stretch wont harm the plant in any way, if you could get your temperature down a bit before that would help with the density and the yield at the end. But beyond that you can rest assured you're going to get a killer harvest. Hope this helps ! š