well, the quartermile time that subaru claims for their wrx was done with a professional driver and also under optimal conditions. (as you said elevation, temperature, humidity, etc.) The mid 15s quarter mile you ran is pretty reasonable considering the elevation we're at, and the condition of the fallon track...
on another note... you launched your stock wrx?!?! how old was it and how high did you launch from?
Above 5000- 5500 rpm's, and you're crazyyyy