Sorry folks, do not mean to be rude here butt...never, never, never smash a `burger' patty after it hits the grill. The 'fat' is what gives beef its flavor. Why would you squish all of those flavorful juices out of a burger?
Marbling in steaks anyone?
If you do not want the fat, then why are you eating beef? God made chicken and tofu for a reason.
If you want loooow fat burgers, buy loooow fat hamburger.
Make your patties with 1/2 of the spices mixed in, slap on a HOT grill/cast iron skillet so as to initially sear and SEAL the meat. TURN ONLY ONCE!!!
Season patty AFTER first (only) turn since spice flavors are neutralized after exposure to heat. You want the spices added to meat during last 5 minutes or less of cooking time to have the greatest effect.
Personally, I buy hamburger that is no LESS than 50% fat, not that 85% reduced fat shit, mix in about 8 Oz. of softened Philly cream cheese to a pound of burger. Add coarse ground pepper, a little crushed garlic, little Costco seasoned salt, maybe a little red cooking wine. Slap that bad-boy burger patty on the grill and hit it with 4-5 good drops of Worcester sauce, grill for 5 minutes, flip, season again, grill for 3, then done!!!!
PERIOD!