Replying to Captis 178 right size/ski for me?

Hey guys. Been riding hand me downs from my dad for far too long and wanna get my own pair for next season. Always used my dad's old skis but he isn't really my size or shape.

I consider myself fairly competent/advanced at skiing. Double Black Diamond runs on the occasion in Tahoe/Colorado. Ride 70% on piste and 30% off. I feel like I ski fairly agressively.

Was looking at the Black Crows Captis.

Now Im really skinny and lanky. 5'11" and 165-170 pounds. Was wondering what the best size would be for me. I've always ridden shorter skis... Not by choice tho really (165-168cm) and was looking for input for my next and one ski quiver.

If anyone has other makes/models they would recommend for my build I'm all ears. Thanks in advance.