Yes, when you apply another AMEX card they use most recent SP, which is typically one month late compared to your credit report at the time.
AFAIK, it can be as much as close to 2 months out of date unfortunately. Amex SP's customers once every two months is my understanding of it, so it may well be more than one month out of date depending how various reporting timelines break for one's individual report.
My util was around 50% when I applied/was approved in May of this year. I was a member in 2006, but with no real history with them 'cause I cancelled the card after 2-3 months.
EX Fico was 701 according to them. No negatives, decent income.
I think what I am going to do is wait until around the 13th of November to apply. This way I can also pay down another $1,200 total on 2 other cards so that those will also be reported to MyFICO by that time. What I have been doing is paying off most of my balances a day before the statement generates so that once it does, I use the card to pay bills with what is left on it. This way it looks like the cards are being paid down significantly and the credit bureaus won't know until a new statement is sent to them a month later. Does this make sense?
Amex has softed me on tu every month on the 28th since I got a zync in march. They have softed me on ex on the 24th of August and September. I don't know if the two softs are for my two cards, or they are just extra interested.