I finally got around to brewing this about 7 weeks ago. I looked through my logs and it turns out since 2004 I've NEVER brewed an all-Cascade pale ale.
Kept this KISS all around. Water was RO with just 60 ppm Ca, 40 ppm SO4, and 75 ppm Cl. Nothing else. The only recipe changes were adding 3 oz acid malt, 0.5 lbs Cara-pils, and using US-05 (what I had). 1.052 to 1.009 @ 67*F. I'm sure the US-05 had something to say about that attenuation.
This recipe is a perfect example of how simple can be great. It took about 5 weeks to really clear, but it turned out beautiful when it did. Creamy head, very clean bitterness, perfect malt finish, although not a ton of hop aroma. It is scary-drinkable. I might use this as a base for some other single-hop pale ales.