Thank you for sharing the settings. Will give those a try next time we ride.
Kim just released our board rack supports to our Ebay store. This was a CAD project completed by a paid summer intern we had working for us last summer. Locally made right here in Oregon.
They are designed to be mounted to common unistrut which is convenient because then they can be adjusted up and down as needed to accommodate thickness of board and the length of the fins.
All the best, Hein
https://www.ebay.com/itm/Board-Racks/143259723364