leg pressure

I've recently switched barns and my new instructor has picked up on a few of my bad habits. I ride English. 1) My legs flap a little when I'm not focussing really hard, how can I make my legs stay still? 2) My right leg gets too far back, and I have real trouble making it stay more forward...

There is a little quarter horse that i ride at my barn and he is usually a good horse, but whenever you give him any leg pressure or voice cues to get him to go faster he drops his head and pins his ears straight back. He will trot reluctantly but with his ears pinned back the whole time. But...