Help analyze my HIM (Page 2)

My training logs are up to date (August was horrible for me as I didn't hit any of my training goals).  The morning of the race I went through my usual routine, got up early 2 cups of coffee a small breakfast.  I'm wondering my performance is due to a fitness limiter or maybe I didn't take in enough cals or do I just need to HTFU?

The swim entry/exit was rough but once I made it through the break it was pretty smooth and my sighting seemed pretty spot on.  I felt good through the bike.  The wind didn't pick up until my third lap so I dialed it down a little going into the headwind and took advantage of the tailwind going the other direction but made sure not to push too hard.  The run is where I wonder if I've gone wrong or if my 12mm is just where my fitness is at.  Coming off the bike I had some quad cramps through the first mile of the run.  Those went away and I was able to jog the first half of the run but then I just fell apart and had no energy left.  I jog/walked the rest of the way and my quads/glutes/calves starting cramping up once I hit the sand again. 

My nutrition through the bike was 1.5 servings of perpetuem, 1 bonk breaker.  through the run I had 1/2 a gel flask.