Never under anything, you'll regret it .... over a Stratus....we'll I guess so, but you better be buying a big jacket and hope it doesn't get in the way across your chest or on your bow-arm when shooting. Too tight it severely restricts movement, too big it gets in the way.
Sounds like you already own it and trying to make it work...if that's the case you might be better off layering under it instead of the stratus, maybe the base-layer, topped with fanatic hoodie, and the celcius jacket...the Downpour will offer some windproof characteristics that the Stratus offers and the celcius will offer better insualtion than the stratus. Might be a way to achieve what you are looking for.
For what its worth the Downpour is one of their least effective pieces...there are plenty reviews citing everything from durability and noise, to fabric saturation and breath ability. If you're considering rain gear Kuiu really is the best on the market. It outperforms almost all others in a series of side-by-side tests and if customer reviews mean anything, you're hard pressed to find a bad one...I know you said you don't care for the pattern, but might want to ask yourself which is a more important quality in rain gear, staying dry or pattern. BTW, I wasn't necessarily a fan until I wore it in the woods...very effective on the ground or in a tree. I run Sitka almost exclusively, except for rain gear, I sold my Chugach set this spring in favor of the Kutana and don't regret it for a moment.
Hope this helps a little.