All this work was added due to filing for N-400 under 3 year rule, which has the same bonafide marriage criteria as I-751. Add to that undecided I-751 and you have two reasons for bringing updated evidence to the interview. You simply can't know for sure whether your I-751 would be sitting for another year without movement, would you not applied for N-400. The choice whether to bring additional evidence or not is up to you. You may find that when you bring this evidence you won't get asked for anything from the pile of evidence. You may also find, if you bring very little you can get grilled and scrutinized more than usual. You can read VJ and conclude people who take N-400 lightly regret it because they get RFEs and stressful interviews, while others who prepare seriously for it, describe the interview as the easiest part of immigration process. Make sure your US citizen spouse attends. Good luck!