Aiming at the brisket is too low. With archery frontal shots you need to aiming slightly above where the neck comes out of the chest. Look a deer side on and draw a horizontal line that goes through half way up the chest. Look at where on the front of the animal this height is, a lot higher than the brisket.
Look at this link https://johnstallone.me/frontal-shots-with-a-bow/amp/
Scroll down the link and there are a number of pics with aiming locations for frontal shots.
Bookmarks