Stripping fan leaves the way people do on bushy indica hybrids is a mistake on most sativas, which already carry fewer and thinner leaves and rely on every one of them through a long flower. Removing a handful that block bud sites is fine, taking off half the plant is not. Some of the before and after photos in the training guide on https://hazesativaseeds.com show how quickly a heavily defoliated sativa stalls compared to a lightly pruned one. Slow recovery on a 14 week strain costs you real time.