Wow, Great read and info here.
I am currently going round with SF. It was a hip roof cut up with valleys. Of course you already know SF and their company line. Total was 51sq and they paid out at 59sq, when in reality we used closer to 66sq. Your spread sheet called for 12sq just for the H/R, Valley and Starter.
Thanks so much for putting in the amount of effort needed for this and then freely sharing it.
I could not however find the Drop Box link for the instruction page you mentioned. Can you please re-post?