You sound an awful lot like my wife and I when we first started out. If you, by some miracle of god, didn't figure it out; communication is the biggest must. Not just after trying it out, but before (which is definately more important). To date, we've just been soft, but are definately open to going full swap once we meet a couple that we feel comfortable enough with. The first time you see her with another girl is obviously an instant classic memory etched into the back of your head like a cave drawing. BUT, the first time you see her even fool around with another guy, like you said, it's a different story.I, for one of many here, find it SUCH an immense turn on to watch her getting pleasured, and also pleasuring him. To me, at least, it's kind of like watching her in a porno, only MUCH better. Even though we don't have sex with other couples (yet), we have mind blowing sex when we get home from a club, just thinking about watching each other.
You are definately making the right steps, and great decsisons. Keep us updated on how things go, better or worse. When in doubt, TALK.