I just wanted to jump in and say that I had the exact same problem with EdWort's Haus pale ale, really muted hop flavors except for the soapiness. The water in Honolulu is pretty soft, our water reports don't show SO4 ever being above 30ppm.
I brewed the Outer Limits IPA a couple weeks with some gypsum to up my sulfate to a little over 200ppm and so far it tastes great in the primary. The hop flavor is pronounced and the bitterness is nice and sharp like it should have been with the APA.
This is a message to the future: If your pale ales are soapy, your sulfate is probably way too low.