This just got bumped up and it's probably too late unless you are going to redo them in 1/4", but I figured I'd toss in a few notes that may or may not be relevant depending on your goals.
1) The turbulent zone will propagate higher than the tallest point of the cage. Indy Lonnie did some
testing showing how high you have to get for laminar flow. You'd probably have to go even higher since the wing is located aft of the main roll hoop. Unfortunately at your current height the bottom of the element will not see laminar flow, which is where most of the downforce is generated.
2) I believe that is a 9LR airfoil, or some form of airfoil where the wing mounts are welded to the airfoil? I would recommend making sure that the mounts are very rigid laterally. Any slightly movement could cause the mount to break off the airfoil. Aluminum doesn't perform well in fatigue, and aluminum welds perform even worse. It's no fault of 9LR, but they are known to fail at the mounts when the wing can shift laterally since it puts a cyclic bending load at the weld. It will probably take years, but losing a wing on track is no fun. I've had success with mounting the uprights at an angle (think of a trapezoid) to avoid needing cabling or gusseting, but in those applications the uprights were about half the height of yours.
3) I would recommend a more conventional mounting pattern for adjustment with a hole pattern and low profile hardware. This will minimalize the disruption around the mounts, it will be more rigid, and will make it impossible to accidentally "twist" the wing. Turnbuckles are great but usually adjustment that fine isn't necessary and the coarseness and repeatability of a bolt pattern makes it easier to dial in (IMO).
