I think you are good, although I would brace it even sooner than you.
Because bracing is done when good initial bend is established (which you did) as long string tillering is deceptive. It basically pulls bow at tips and doesn't really bend enough inner thirds of limbs. One can even be satisfied with long string tillering look and then be surprised when at brace bow shows stiff spots at inner parts of limbs. Just because long string couldn't unveil them.
