Speeds to Rotate

Can anyone tell me what I have to alter to get an aircraft airborne earlier than it wants to
I have a few BAC 1-11 on board (I belong to BEAV) but these aircraft seem to need a massive length of runway before they will rotate. I usually cut the grass at the end of most airports, a bit embarrasing online. I know it may divert from realism, but realism is not what I am getting anyway. I am sure a 1-11 should get airborne earlier. I have followed flying instructions for this plane but I cannot find a combination of speed, flaps, etc that works. At rec take off speed 130 kts.. no chance. Rec r/way is 6000ft. Any ideas 
Tony C (Bucks, UK)


Tony C (Bucks, UK)