I think most folks settle for between 3 and 5 degrees of helical fletch for their helical fletched arrows. The local shop fletches them at 5 degrees and many of the customers use these arrows with the WB and without any major concerns.

In my experience and opinion, the less helical you have then the less wear you are going to experience on the fletchings because of WB's design. Also opt for a stiffer or shorter fletching to help further remedy this issue.

Hope this helps.