I've done defol before, but I'm not convinced it helps this early on. You could strip some of the lowers that aren't receiving any light. They usually yellow out and die either way, anything getting light leave on at this stage, that's my two cents!
I'd only advise full defol week or so before harvest to get lower buds developed.
Patience is key bro, I know the feeling wanting to be 'involved' giving nutes and defol but I'd say best K.I.S.S. specially on first go!:smoking: