I have been at the same place, performance wise, for awhile now and am just starting to hit the lip regularly. For the longest time I could sweep my bottom turn back up the face but that was it, I could not make the board turn back down. As I slowly got better at it I found that having by back foot all the way back on the leash tie with all my weight on it while squating down low. I place the paddle down wave and concentrate on turning around the paddle. At the same time a very wide stance helped once the "lip" turn was made. The stance doesn't look pretty but it was the only way I could hit the lip and still stay upright.
I should also note that I never did hit the lip properly till I got my new board. I was riding a 10'6"x32" Costal Azul (a local shaper.) Turning that log was a chore. I now have a 10'x29" Paddle Surf Hawaii board. It took the big board to teach me what I really needed to be doing but the new board lets me get it done.