Zacher, I've seen a bunch of recipes too, so given that, go with your hunches! I brewed a clone attempt once and felt it matched pretty well. Drinks more like a darker special bitter than a dark nutty/toasty/roasty brown to me. Given the low level of crystal malt in yours versus the amount of brown/chocolate and bitterness, you might be a bit on the drier side of things. My recipe had triple the amount of crystal and it was a british variety, which IMO, will get you closer to original. You are in the ballpark so if you can get bottles of SS, brew this and compare! I haven't had much luck with oats so I think at this rate I don't think it would contribute much unless you've had experience with them otherwise.
