It is true that a lot of people feel that hitting the target is always the number one priority.
However, also consider injury potential from shooting in this manner.
IMO, you want to engage the large muscles of the back as much as possible, especially if you are shooting a lot of arrows. This will be very difficult in the manner you are shooting.
If you continue to shoot in this manner, I would be sure to do a lot of stretching, and warm up excercises before and after shooting.