I also just picked up a SJ about 3 weeks ago. At first it was really tough, the first couple times I went out I had no problem getting up but porpoising and cavitation were a real issue. After a couple more days of riding and learning better throttle control and riding position I noticed a huge difference. Now I'm pulling 180's and turn subs, and can carve up though buoys no problem. Give yourself a couple of weeks and you'll have it down.
I'm also going to upgrade to a swirl impeller and worx 201 as soon as I can, the stock power feels like more than enough if it could just hook up! Right now it only has ODI grips, the steering throw mod (on the steering bracket and nozzle), and bilge. Definitely do the steering mod, it does make a nice difference in being able to "flick" the ski or even transition.
Really nice looking decals BTW!