Quality of play improving at a higher level?

[ahsfl]

Ok, I normally play the $5 or $10 MTTs or 10NL 25NL but last night got a wild hair and bought in ss ($125) on 400NL on FTP and ran it up to just over $1000 in 2 hours. An early double up on the ss could be attributed to some of the winnings but looking at my session notes I also played a pretty solid game (29.73 VPIP, PFR 16.89, TAF 1.19) and felt generally it was much easier to play an ABC game and suss out a lot more accurately where my opponents were at by their bets and where I was at in response to my bets. I know that it is said repeatedly in this forum and in plenty of poker literature that it's not because ur opponents are donkeys that is the reason u lose, it's an individuals ability to adjust to the game, so is it possible that I have a solid enough understanding to move up atleast to maybe 50NL or 100NL or was this just a lucky session, any other thoughts?