I'm another believer that loose is better than tight, too. I usually aim for the outside limit of the spec window (.8-1.2"), but often times end up too tight after everything is buttoned back up (I'm way too familiar with that "WTF whirring" noise you talk about
). I now aim for about 1.5 before things are tightened back up which usually puts me at about 1"-1.5" when I'm done.
Personally, I think 2" is a bit much, but if you keep a close eye on it (check it often), I'm sure you'll be fine. I really like it that these chains seem to stay pretty consistent after the initial "new chain" stretch and don't require much adjustment compared to the chains of years ago.
The main reason for being cautious of a too loose chain is the possibility of the chain coming off the sprockets. If you think you're okay, leave it where it is. Another reason is it can move around enough to touch other things which will wear grooves in things you don't want it to... sprocket covers, swingarm, chain guides, etc.