I have taken 2 to 4 deer a year for the last 45 years bowhunting. 90 % of the time I'm been setting on my big butt at the time. To me 20 are 30 yard is just that and I don't mean from the bottom of the tree from me to the deer. Don't bend your head are lower your arm to aim the shot are your going to shoot high. Bend at the waist to aim. There are shots I don't like from a stand and one is for them to be right under me. To much angle, less vital to shoot at. rib bones coming of the spine to deficit my arrow and it hard to get both lungs. I like them at 15 are 25 yards ,so I have lots of vital to shoot at, can get both lungs and a pass through. I have probably had deer jump the string , but I really can't remember. Just don't shoot at a alert deer are they can jump the string. With todays fast, hard hitting bows and the arrows we have today you should have less problems with yardage less chance of them jumping the string and pass throughs 98% percent of the time. You owe it to the game you hunt to be at your best to make a clean kill and most of all to yourself.