I had a WB for a month or so, but I will throw in my 2 cents also.
For me (I had an original WB), the cock vane down did result in more fletch damage and wrinkling. I don't know if this is true for the Drop Tine, and it doesn't look like it should matter with the Deluxe WB. I shot feathers and vanes through a new bisquit, and did not have terrible problems with fletching, as long as the cock vane was up. I think I might try this rest one more time to see if selling the one I had was a mistake.

Avoid the inevitable until it is absolutely unavoidable!