What grade beef do you use (85% lean, 90% or ? )?
When I did it the old way on the grids I would have to use 90% at least to avoid flare ups and burning.
Using this new method I use anything...cheapest I can find. 85, 80 or lower. Doesn't matter. Sometimes I mix 90% with a little ground pork. Good flavor there.
With the CI griddle though, a little flame time gets the excess off. If they can't stand any more cooking (I like some pink in the middle) then I'll place on paper towels before bunning them up.