It's the same phenomenon that we saw with Cam Talbot. The team, and particularly the defense, just plays way better when someone not named Henrik Lundqvist is in net. In the last 3 games, Raanta has faced 18, 26, and 19 shots respectively. In Hank's last 3, he faced 31, 28, and 32. It's like they need to lose their safety net in order to be motivated to do their damn jobs properly.
Anyway, I think you have to put Hank in on Tuesday at this point. Raanta just had 3 games in 4 nights, which is a lot for anybody, let alone a guy who doesn't start much to begin with. He needs a rest, and Hank needs back in. You'll need Raanta for at least one of the two road games later this week anyway since there's another back to back coming next weekend, including a rematch with these Devils.