Your approach sounds very tasty. I've only done several saisions, and only one with NW hops, which was a version of Major's kaffir saison (+galangal), that used amarillo at 4.3 IBUs at 2 minutes (aroma) which worked nicely without transferring flavor dominance from yeast to hops. It also had magnum at FWH and 50 min, fuggle at 30, and 2.2 IBUs of EKG at 5 min, for a total of 28 IBUs. It was well-liked by visitors, and me!