This makes zero sense. Do whichever thing you wanna do first. Doing the raid first will not change what you will end up getting in the NF.
Its not that, NF you wanna save for last
Hell that should be the bookend activity when you've burned through all your resources
I'm not touching NF till say Sunday, hell Monday the earliest
By that time, LL gained will benefit in NF due to rewards being up to max
Say you do NF today get a +4 item to push you to 387 or 388
Now by Monday you do it, might be 396 LL, you have a chance to NF to giving you an item close to max level
NF should be last rewards netted till next reset unless you've hit 400 LL
This goes for everyone @365+
Wait to do your NF till weekend or Monday before Reset, get good gains during the week, then bookend it with 3 rewards to really help you push up more