I've found places that adopt the /exact opposite strategy/ tend to be the nicest.
See: Bay12, which has no user mods at all, and Toady only comes down for serious problems - we mostly take care of ourselves.
Community expectation and reinforcement are far more powerful tools than running to the mods for every slight issue. And with mod-beggin, if it isn't resolved to the users satisfaction, you now run the risk of a public fight /with a mod/ which undermines... a hell of a lot. In my experience, mods are often the number one source of drama in most places. When another user does something stupid, it's just another user - when a mod does something stupid, that's the /system/ attacking you, and like all authority, they will tend to band together in the face of opposition from non-mods... even when the mod in question is utterly in the wrong. If you've got fair, responsive mods with limited involvement, awesome! But if not...
I'm not saying this will happen here - but from what I've seen, the more mods you add, the more likely it is to be an issue, and the greater the pressure (and expectation of wielding power to resolve even minor situations) you put onto mods, the greater potential for devastating and long-term drama instead of brief and temporary flare-ups between users. Especially since your moderation rules amount to "Get rid of whoever you don't like - after all, anyone who disagrees with you is an asshole and anyone who comments on something being wrong or improper is clearly an oversensitive".
Honestly, I think those two rules may be the best way, combined like that, to create drama that I've seen in... quite a while, really. Especially when both end up defined as "the mods whim".
And "growing a thick skin" can just as easily be seen as "acting like a coward who's afraid to respond appropriately to egregious behaviour". Don't make waves - let yourself be victimized! If the other guys an asshole, the mods will take care of... maybe. Eventually. If you can't take it, you don't belong here - If you (or anyone else) tries to do something about it, you're clearly an oversensitive and will be given the boot!
It creates an environment that accepts bad behaviour as inevitable and unpreventable, honestly.
You don't really need to take any of this advice into account, of course - I may be wrong about everything her, and I won't exactly be around, and don't really care. But I feel like you might setting yourself up for further trouble here.