I wouldn't add more files unless I'm asked to provide them, or it makes sense to add them. For example, in my case, I originally did not submit the police certificate from my home country. Like you I got a case FE asking me to provide my spouse's W2. When I uploaded that doc, I also added the police certificate because I received it before Nov.
If you can sleep better at night knowing that you provided most recent paystubs, you can add them in additional documents section