Matt,
Dusty probably has a few more hours on his 22 than I do, but after about 30 hours I have settled on a 13.75x15 prop. As indicated in an earlier post, I get about 31 mph at WOT 5000 rpm with a moderately heavy load. This is right in the center of the recommended rpm range. I orginally started with a 14x17 prop and got 32 mph at 4750 rpm but the boat was light. I think Dusty is using the 15 inch prop, so for lack of more data, I would go with the 15 inch.
There is no break in period, but I do have one thing to have the dealer check when you pick it up. My E-TEC kept returning a no oil alarm on start up each day. I would clear the alarm by going through the winterization/prime procedure. The engine would then operate without any problems that day. It was finally corrected with a new software load and hardware map. If you are planning a sea trial then ask when was the last time the oil system was primed and test run. If it's been more than a day then press with the sea trial. If the problem happens in the sea trial, go ahead and prime the oil and press with the sea trial but have the dealer call Evinrude for the proper software and hardware mapping. If it doesn't occur then you are good to go. It might be a good idea to ask the dealer to check the engine specifically for this problem. If he has already test run the engine after mounting and rigging, ask him to run it up again the next day for about 20 minutes. I was always able to induce this problem within 20 minutes.
As far as a kicker and trim tabs are concerned, there isn't much room. We tried a couple of different arrangments for a 9.9 Evninrude 4 stroke and settled on a hydraulic mount on the port side. I steer using the ETEC and maybe lose .5 mph. There was no easy way to use an easy steer or similar arrangement due to the offset between the two motors. It's not ideal but works reasonably well. I tightened up the steering on the kicker so it always stays straight ahead. I'll PM you a couple of pictures of the mounting arrangement. The main issue we ran into with the 4 stroke kicker was its size. It was always in the way of the main engine when mounted directly on the transom and the trim tab was in the way. The only thing I would consider doing differently is mounting the kicker on the starboard side. With the weight distribution on the CD22, if you are carrying two passengers a lot of the time, you may find you need more weight on the starboard side if you are full of water. With two people on board I always first burn fuel out of the port side to lighten that side of the boat to lessen the need for using trim tabs. When that tank is near empty the boat is in proper trim without trim tabs.
Sorry for the long answer, but nothing on boats is necessarily simple. How deep is the water in Bismarck?
Tom