I don't think you had any winning chances once the queens came off. the passer on e6 is unpromotable with black's king in front & his rook able to check from the rear--it's a basic philidor position gone bad (for white), isn't it?
e.g. http://www.jeremysilman.com/chess_basic_endgm/040110_philidor_pstn.html
I can't see how the presence of the flank pawns changes much, unless to it's give black some winning chances. white's king is never going to find shelter.
Here is a recent chess.com game. It ended in a draw, but I seem to think I must have missed some winning moves. Any thoughts?