The 19 can get really skinny too depending on whats been done to the boat, just keep in mind that weight added in the wrong places will make any boat draft more than it's potential. But if all weight issues were equal, because of a slightly bigger footprint on the water the 19 will be about the same as the 17 and they usually have similar power on the back, can't speak for the 22 haven't been on one.
The 'advertised' hull draft of an early 70's Aquasport was 7 1/2" for the 17, and 8" for the 19 and 22. But they never made a 19 flatback, that's a 222 model only.