Ok, well you can take A LOT of approaches to it. The most beneficial would be to go to 17mm. But since you already got 23mm wheels, don't worry about it until you wear out the tires.
1) Try and contact the people I told you about, that will probably be the smartest thing to do.
2) Do some kind of mods yourself like grinding down the 23mm hubs so that the hole the pin goes through is closer to the edge..(this way you can shim the hubs similarly like the 17mm ones and get the same result)
3) You can drill new holes in the arm that are a little closer to the diff, thus pushing the CVD farther into the diff, which is your goal ultimately.
4) You can probably think of a new idea to mod things, too. One thing that I was kind of curious about was if you can get longer CVDs. You can look around on the net and check out specs.
5) An idea I just remembered would be to limit the uptravel on the shocks. It's sooooo easy, just put a small length of fuel tubing on the shock shaft..because you know the reason the CVD is falling out is because the arm moves so far up that it pulls the CVD out. This is definitely the easiest and cheapest fix...do it.