For the head issue, in a fluid motion, raise and lower your hands along as though you were moving his bit. Don't think about where his head is. Think about placing the bit where you want it and moving him up into it. It will take time to build the new habit.
As for him not responding to the leg, he needs to be held responsible. Give an aid once and if he doesn't respond, hold him responsible and get after him. Not one tap or one kick, like three hard kicks or taps with the whip. Make a correction for not responding. Try the cue again and see if he responds. If he does not, get after him again. If he does, give him a "good boy" and a pat. The aid should be a little teeny pressure. If he can feel a bug on him there's no reason why he requires a stronger aid than that from you. Do not nag him by asking over and over. Give the cue once and correct immediately if his response is not an immediate surge forward.
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