Every time I line up on the runway I rely on the theory of flight, I haven't been disappointed yet. If you feel you have discovered situations where the theory doesn't hold, people would be interested.I already mentioned I could only get the nose about 1/3 up the pine trees; there was no way it was going to go anywhere near getting over the pine trees.
Once again you're talking your own theory.
Just pulling back at 100 knots and trading altitude for airspeed should give you about 200 feet by the time you're down to e.g. 70 knots. You can try this at altitude if you don't believe the theory. Setup for 100 knots straight and level, pull back into a climb without touching the power - by the time you are down to 70 knots you should have gained 200 feet.