depends how far along in the flowering stage you are id say, if its still in transistion shit yeah id tie some shit down if ya need to, after the buds really start to produce id probably stop tho stems seem to get a lil more fragile are that point....
I wouldn't try to do it to the extreme and would take it slow, but definitely not too late..I would bend/tie the main cola(s) down/out and spread the side branches as wide as you can..take it slow and don't snap colas...good luck +rep if it helped