removing leaves will make it even more sensitive to any overdose of nutes in the medium, if that is the case.
"to defoliate or not..." Article on cocoforcannabis.com -- covers why / why not
this isn't an over-crowded canopy. there's no reason to do any defoliation. Now, if you want to remove soem lower axilla (branches) that you know you won't use later in the canopy, that's fine. that's 'pruning' not defoliation