I'm on the side of both Hashy and HerbalEdu here... defoliation is definitely beneficial for such a bushy plant as yours but do it selectively and slowly! Flowers need light to grow big - the more light, the better! They may be getting more light when the tent is closed up - but they'll get even more if large fan leaves aren't between them and the light! And no, I have yet to see any cannabis plant that grows more leaves if you remove some leaves...
Be selective - choose leaves that are blocking bud sites - and go slowly so you don't overly stress the plant... do a little today, wait about 3 days and do some more... I've defoliated all the way up to 2 weeks before harvest!
Good luck!