To see clearly that distance from the base of the tree matters and not yardage from the bow (or rangefinder) take an extreme example, it makes it more obvious. Think about your stand being 90 feet up and a deer is 10 feet from the base of the tree. Your rangefinder will tell you that the deer is more than 30 yards away. The arrow will only be falling over a lateral distance of 10 feet.
As mentioned by many on this post 30 feet up is pretty high. The angle to the deer is too sharp and a double lung shot will be very hard unless the deer is pretty far out. If you plan on a spine shot, straight down is fine, however you better be shooting 1 inch groups to attempt this. As hunters we owe it to the deer and the sport to make quick clean ethical kill shots.
As far as the white hair and the meat and not much blood on the vanes, it does not sound like a lung shot at all. Any lung shot that is a pass through will cover the arrow with blood. You grazed the bottom of the chest or belly and even with some blood only educated that buck. He is fine.