Vitamin Ski I have some thoughts;
Like it has been said before, the base bevel will only affect how quickly the ski "hooks up". I, personally, run a .5 base and 3 side on my beer league (read 191 racestock GS) skis. Increasing your side angle as far as 5 makes for a sharper edge, but also one that needs to be maintained more often. If you don't tune your skis before every run, like the World Cup folks, you end up on a duller ski more quickly. That is the ski side of things. The width of your boot should not be the problem, just gonna state that.
Is that picture next to your name you? I am going to assume yes. On a fall away turn it is very important to keep your center of mass over your feet and moving through the boot. In looking at that one picture I don't see a lot of leg length difference the result of which is your shoulders are tipped into the hill. You don't need to widen your feet apart, you need to widen them vertically. Take a picture of Ligety going around a GS gate. if you re-orient him so that the skis are flat instead of on edge you'll see that his feet aren't more than hip width apart, but his inside boot is somewhere near his outside knee. Leg legnth difference is the "answer" your look for. There is a lot that goes into achieving that difference, but that is my two cents.
Let me know if you need/want more,