I would not do this indescriminately. How does your current setup shoot a broahead? If you add draw weight, you field tips may continue to fly in a similar plane, but your broadheads are more likely to be adversely affected by the change in dynamic spine.

The proper way to determine draw weight, is to bareshaft tune your arrows, adjusting draw weight, until you get the perfect combination. That is what you want to use when shooting at animals with broadheads. Any abitrary number that you happen to set it at, could be a disaster.