Moderate to light weight,highish reps...... "pull" physically and mentally, with your lateral head only, hold for a second or two at the top for peak contraction......(HINT,yOU CANNOT DO THIS WHEN EGO LIFTING SO PUT DOWN THE 80 POUNDERS.... THANK ME LATER)........lower using the power of the lateral head as much as possible.....do not let the weight just fall to the bottom position.....you are supposed to be in control.
I tip mine at the top as if pouring out a liquid........bro-science?.........maybe but I always had good delts.