Great, thanks for posting.
I'd (and do) shoot for the same number as for the 5's as well.. But no matter what the faq tells you, it will still come down to whether or not, you are able to handle it.
In my experience, negs are considerably harder on joints and CNS both. And considering there is no weight progression, there as no light-weight break.
What i'm saying is, you might have to cut back a little. You'd probably by fine though, with only 2 lifts.