This one may qualify as a bass sweep too and I always wanted to see a graph of it.
Monsters Inc - Boo's laugh - Timestamp is 30:44
My personal view:
Don't use any smoothing at first to reveal nulls. Move subs around, adjust phase, distance, etc. to remove the nulls. You've solved for the isolated tone situation above.
Once the nulls have been removed, switch to what we 'hear'...from what I understand, 1/6th smoothing. If you have an external EQ, tweak your curve from this 1/6th view. Set and forget.
The assumption here is that we can only hear at this resolution: meaning if you have one curve that is completely flat with no smoothing, and another curve that is a little choppy with no smoothing, but both curves look exactly the same at 1/6th smoothing, that you cannot audibly tell a difference between the two curves.