I agree that they do excellent work, I simply chose Nightingale because I think that they do good work, but won't generate strong emotions in the community.
I sent an email to Vivint a while ago asking if I could post on a vote wall asking for support, but making it clear there will be no trade of votes. I didn't get a response, but I can't see how that could be considered wrong. I wouldn't do it for WPI at this point, just in case, but I think it is worth trying.
I have posted a message in one place and will do another tomorrow asking on behalf of Nightingale. I don't know if there will be an impact on the numbers or not. If the consensus is that IACFS is the better choice, I will change my request, but wanted to get todays votes in while we decide