I have a lot of success at the $3 level on PS, winning quite often and making the money on a regular basis which has improved my bankroll quite significantly.
I find at the $6 level there isnt too much difference, perhaps a few less fish, but they can always be found, I find I play best in the afternoon over here... which would be very early afternoon in the US, sort of between 4pm-7pm (UK) which would roughly equate to anything between 11am-2pm over there... perhaps people play in their lunch breaks so are rushing decisions....
The $12 SNGs ive noticed are a hell of a lot
tighter.
Mind you ive only played a handful, and havent cashed in a single one yet.