I would disagree with the premise of improvement. I would rather call it. "The Rams offense have had better games recently." "Improvement" to me is more permanent as we have seen this show for 3-4 years now where it appears things are going in the right direction and than puff, not so fast.
What will we do when the offense has back to back games with less than 300 yards and less than 20 points? Say those games don't count either.
The Rams have 10 games left and some will be better than others on offense. I rather see last week as the rule versus "the exception" before I start using words like "improvement".