I've done beers with a hop schedule much like yours and found the hop character VERY delicate. IME Sterling is subtle and mellow, as befits a "noble" clone, but not nearly as herbal as European Saaz-type hops. [FWIW if I did your amounts -- and I use Magnum a lot too -- don't think I'd hit 25-30. But you know your system.] Of course YMMV.