I had the MK mechanical unit on my ZN Alliance but I found like you that flying from grass I was continually having to re-bend the wire and even had some cumulative damage to the wing as a result. The strut bending tool works well but in the end I removed the retracts and fitted a carbon fixed u/c to the fuz in front of the wing.

Now I can fly all summer long without having to worry at all about the u/c, and I actually have come to prefer the look of the model with the fixed u/c, it seems to suit the modern style of airframe.

I also noticed no difference to the flying performance with the fixed u/c.

James