Good for you for getting to the range & practicing.
Dunno about the rest, but the shots going high are probably because your eyes are racing down to the target to see how you did, instead of staying fixated on the front sight until you have completed your follow through.
Try this next time: after the shot goes off, continue holding the trigger completely to the rear until your sights are lined back up on target. Count one-onethousand, two-onethousand before you release the trigger. During that entire time
, do not allow your gaze to shift to the target itself. Keep your front sight in extreme focus.
After you have done that with single shots, try shooting an entire magazine without allowing your eyes to change focus from front sight to target.
Let me know if that helps...