So it was buffed just recently, nice. I don't think I was the only one who said something about it but I've definitely been one of the most vocal about it. That's actually about a 100,000x increase which should help it keep up for a lot longer, or at least if you level every girl rather than just a few. Maxing out every girl might not result in more spiral power if there's a cap based on total levels, but otherwise it might.
When you say Spiral does nothing to the Campus girls now, does that include the City, Countryside and Beach conquest girls or just the College Campus conquest girls? Probably a bug either way. Helping against the conquest girls is one of Spiral Power's main uses. That includes having Titnosis keep doing it for you while you relax or take a break. So hopefully it's just a bug.