I also have my HT2-TLs set up with the tweeters to the outside. My thought was to maximize the soundstage width. Also, although different designs, I remembered I preferred Magnepans with the tweeter to the outside (gave a wider soundstage), so I figured it was a good place to start.
dgriff, we seem to be in the minority with the tweeters out placement.
Before receiving my Salks I asked about the "proper" way to set them up (tweeters inside or outside). Both Dennis and Jim said there was no "correct" way and to experiment with both and see what works best for me.
I must admit I haven't tried them with the tweeters on the inside, but the soundstage sounds great they way I have them set up so I'm not very motivated try them tweeters in (they're not that easy for me to move).