Off topic, I know... I have no information other than my own palate, but I would bet OF Sig is closer to 8 than 4. I'm not convinced that an 8 year age statement would improve it that much.
On topic, WR was like the second or third bourbon I bought when I was getting back into it. I remember how light it was compared to EC12. I ended up using it up in mint juleps; it really mingled well with the syrup.
I should get another bottle for sours.