Konis Sports are great on smooth track and autox surfaces. They are single adjustable. I'm actually going to 550/750 lbs., almost the same as your 10/13k. This is a temporary step as I will be going with Fortune Auto, Bilstein B-16, or similar. If I were to go 10/13k on Koni Yellows permanently I would have them customed to handle those spring weights. That's $300.+ extra.
The Fortune Autos are double adjustable and are probably better for track and street and you can adjust rebound and compression separately. Nice quality and custom made in the USA to your order. SHG_Easy_E, a very knowledgeable guy on here has just received his and will be testing them very soon. I have high hopes for these and they are probably about two steps up above Koni Sports. There is a double adjustable Race Koni that is also about two grades up on the Sports but the price is rising.
I don't know a thing about Stance. Just the name turns me off, lol. I will research them out of curiosity.
My choice would be Fortune Auto on heavier Swift springs. Swifts are lighter, thinner (more travel), and with a little quicker motion supposedly. A good spring for FAs, as they are compatible with a digressive valved damper. They have some similar characteristics to a rally damper.
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