7SR.
Pilots who rotate to normal deck angles and don't get normal lift off performance should not just pull back more to get airborn. Something is wrong and if you have a long runway there is time to make a quick check of what is wrong. Why waste the last few thousand feet that would fix a flap setting error by over rotating? Hopefully grabbing the flap handle and setting them would get you off ok or even if that was too late the extra few thousand feet would get you off clean. Thinking outside the box if you do everything else wrong might save the day.