Ok, so this worked out and I was freaked out for nothing.
There was a short term low put in on Fri. as expected. This morning should be a high and reversal down. Specifically, I got "daily peak", which means it'll go down pretty decent.
I was given a number Friday morning that I eventually figured out is the next high (at least, that's how these numbers have been working for me...) that projects today's high at 4045 on /ES. If this is correct, there should not be more that about 5 points of error.
The percent down I'm getting is 5.72%, which from the high of 4045 will = 3,813