Well, when I played full ring I was an even bigger nit then I am @ 6-max right now. I'd basically only re-raise AA,KK and sometimes QQ.
Now that I've played 6-max (and joined cardrunners), if I were to go back to full ring I'd open up my game a lot. My re-raising range would really depend on how active I'd been at the table and what the original raisers PFR % was.
In position I'd probably re-raise 99+ and AK, maybe AQ. OOP JJ+
I'd also squeeze light if the conditions were right with a lot of non-dominated cards (Like AJ, KJ, KQ).
Conditions being:
1. Loose PFR
2. Loose caller
3. Full stacks
I don't really know what I RR to. I play on FTP and I just smash the bet pot button