I went up that pass about 10 years ago -- I remember it well and would charge about $5K to do it again with that much weight.
OK, seriously, just reaffirming your feeling that you don't want to do it if you don't have to. It was long, steep, footing was bad, not a lot of shade, had few water stops (I can only recall one, in fact)...
The time and energy it will take you to go down and back up make it worth a reasonable sum to get help, or even to carry more food and skip the pass altogether.
IMHO, FWIW, and good LUCK to you.