chasv77answered grow question 4 years ago Maybe I am slow here, but why are you doing LST? To me it does not look like you have done any topping.
I see no symmetrical branches to tie down. Are you just bending the whole thing over, to reduce height?
I don't think they are old enough, if I have missed something here.
And yes, thin branches are ok, as long as you dont break them.