Here's my process: After your grates are cleaned, rub an oil-soaked paper towel on your grates. Get the grill over 500F and put the burgers on. I let mine sit for 1 minute then rotate them about 45 degrees on a new part of the grate. Cook another 1 minute. Flip them over and repeat the same process and times. Done.
We grind out own burger so they're closer to 90/10 (not fatty). We also make them about 5" across and 1/2 inch thick. I cook them until the juices are clear. They cook faster than those smaller fatty ones that, IMO, always come out still raw in the middle. Slightly pink is OK, but I don't like my meat bloody.
Since I've been smoking and learned to cook to temp, I like my red meat at 147F IT, the wife at 155 (although she doesn't not know that).
Give it a try with 1 burger and tweak it from there.