youre doint it wrooooooooooong
amazingribs.com
look up his "art of burger" or something.
basically cant use off the shelf ground beef. gotta grind a decent steak etc. have your butcher grind it while ya wait, and have him add some fat. then ya do a reverse sear... get it up to 135f or so on indirect side of grill, then stick it over hottest part to get a char and up to 165.... then enjoy!!!
Your doing it wrong.
Venison or Elk preferably.