I think we need to accept that we can not operate a national team in the same way that many other countries are able to do - ie: play a number of meaningful games with all of our best players available for selection, and therefore any FIFA rating we have is not actually comparing apples with apples on most occasions. We need to look at other measures to determine how well we are performing. I'd suggest measures along the lines of performance in world cup qualifying at senior level [I know subjective when determining if we did well against Peru or not], our youth team performances at world cups, the number of players playing professionally in established leagues and competitions etc.
We undoubtedly did well against Peru. More so that our main (almost only) scoring threat was sadly on one leg.
Folks were predicting we were going to get slaughtered by no 5 team in South America.