I also have a CP19. I have a Tohatsu 6hp Pro-Sail with 25" shaft. The motor mount has three positions. I can tilt the motor in the second position,but not quite enough for it to lock. I also installed a Mac's Prop Saver on the foot. What I have to do is tilt the motor in the second position of the motor mount, then raise the motor to the upper most position of the motor mount, then I have to tie a line from the Prop saver to the stern pulpit to secure the motor foot out of the water. When underway I can raise the motor up (motor in down position)with the motor mount to the highest position, but the foot of the motor is still in the water about level with the cavitation plate. I just put the motor in neutral and sail. I know there is some drag, but I don't think it's an issue. I've gotten 6.8-7.2mph like this, so I'm not complaining. I've experimented with tilting the motor up, but the foot drags with the prop saver ring and motor turned it creates a lot of drag. I know a 20" shaft would have probably worked better, but being new to this boat, I ordered the 25" shaft for one major reason; this boat will hobby horse in heavy swells. I don't have to worry about the motor coming out of the water. I also think it pushes the boat more efficiently; I can motor at 6mph at about 1/8 throttle. The 6hp Pro-Sail has a lot of thrust and works very well.
I have thought if I were to add a shim between the hull and motor mount this might help, but I'm not sure? It would be further from the stern which might help with the tilting, but it would make it more difficult to reach the friction screw for the shaft, so I'm going to leave things alone.
I may add a turnbuckle from the motor to the boat to keep it straight when motoring; the friction screw isn't very strong.