My first ride in my 19 was exactly the same experience! I thought to myself, what have I gone and done! At that time, the boat just had trim tabs and not the permatrim. Aggressive use of trim tabs on the 19 is a real adventure!
Take your time to learn the boats characteristics at different speeds. The 19 is very sensitive to motor tilt angle. I use the tilt button almost as much as the throttle. There is a fine line, but it is easily learned. Bow down too much at speed will scare the little willies out of you. The bow grabs and will turn the boat sideways with the smallest input from the wheel. Bow up too much at speed and the flat bottom won't hold well and turns are loose.
After some experimenting time, you will feel in control of the boat, and understand the differences between hull types. A C-Dory is not a WOT boat, this is not to say that you can't run at 30 mph, you just need to get the feel for the conditions that allow that speed.
I find that most of my running time is at about 18 knots. If it is smooth, I can raise the bow, gain a knot or two and feel perfectly comfortable. The boat will handle quick S type turns, those used to miss debris in the water, very well.
I also think that the feel of the steering wheel gives you the best input for handling of the boat at speed. Too heavy (bow down) and you get into the bow steering, too light (bow up) and you can loose more control of the stern.
I now have a permatrim which I think is the best addition you can have on the 19. I find that I don't use the trim tabs much at all, mostly to balance the boat, but I try to do that will weight placement. I think the trim tabs do add a bit of "hull length", which doesn't hurt the 19 at all. The 19 is the same hull at the 22, just with 3 feet "cut out", probably not the best way to design a boat, but it works.
Robbi