[Kurn]

Here's my take on it, without reading any starting hands chart. The caveat is that I don't play much 6-max.

Based upon logic, I think playing 6-max, the SB decision is much less about when to complete, and more about making the right raise/fold decision. Most of the additional hands you add from the SB at full ring (assuming a 1/2 blind stucture), are hands that play well multiway.

At 6-max, you have neither the immediate pot odds nor the potential implied odds to add the suited and/or connecting type hands you play at full ring.

Besides, my limited 6-max experience is that you don't get many unraised pots back to you, so you're in raise/fold mode anyway. If the games you're playing are indeed so passive that you have ample opportunity to see the flop for an additional half small bet, you should ask yourself why not just go back to full ring. I mean, if the game's going to be that passive, wouldn't you rather have 9 or 10 people at the table?