Well it doesnt sound like you're over magnified. Though lower would help to increase your field of view.
When I read your first post, it sounds to me like you are very focused on the rifle, it isnt automatic. Do you practice often? do you have proper follow through after the trigger break? Possibly a milder cartridge with less kick? Possibly something with more stopping power?
What cartridge/bullet/placement are you working with?
Agreed with the above post, there's lots of good ideas on locating the site where the deer was standing. But there maybe something else going on too.