When you say your "main response rate", do you mean what appears under your "basic" stats? I believe the basic stats were based on all the time since you started hosting, not 30 days.
In any case, don't get too hung up about the Superhost status- hosts who have had it, then lost it, then maybe earned it again have said it didn't seem to affect their bookings one way or the other. And it's getting bookings from nice guests that's the goal, right? Not some badge plastered over our photos.
Superhost is just a behavior modification tool- a carrot Airbnb dangles to keep hosts stressed out and kowtowing to guests, no matter how rude or demanding they may happen to be. Hosts with pages full of 5* reviews have had their ratings tanked and lost Superhost because of one nasty guest who left a retaliation review just because they were called out for something during their stay. As long as Airbnb refuses to remove those obvious outlier reviews, Superhost isn't about being a great host, because it's something a host has no control over.
@Wayne61