I would definitly defoliate, Check out mine i always defoliate to provide more light to power buds, so they also become smokable, but don‘t defiliere to much at ones, you don‘t want to stun the grow, rather defoliate a couple times… only defoliate old big leaves that block light, keep in mind leafs a storage of nutriens, it‘s a tight line between provide more light through the cannopy, remove to much at once & stunning growth or remove to much & decrease photosynthesis rate… other than than all based on experience so don‘t worry too much, do some & learn… i would defoliate After the strech is done, never in streching phase…