I haven't noticed much of a difference lately, but I don't play a large volume of SNGs so it may just be a small sample on my part.

Might I suggest a move to $10 SNG if you play on party. the $5 game is charging you $1 (20%) while the $10 game is also charging you $1 (10%). Over time this can add up to a pretty big chunk of money and I assure you the play at the $10 games is every bit as weak and easy as at the $5. Just my 2 cents.

Party SNGs are not tighter, you should have no trouble "staying in the green" while three-tabling them. You may have just had more tight-ness in the small sample that you have availible to you. Make sure that when you're playing, there are 55,000+ players on party poker, that should give you some confidence that there are many bad players online to play with.