Agree. Also wrong short field tactics: You have to keep the nose wheel down until you rotate, so you can accelerate as long as possible on the ground. If you see that it doesn't climb, do not climb, try to catch up some speed und trade it later into height (departure patch was clear of obstacles).
And if you think that you are short of runway, air and power, don't take three people with you! A take off calculation wouldn't do any harm eighter...
Dani