just my opinion, but if you shortened the overall "height" of the guard and then shortened the lower bracket so it runs parallel to the frame, it might not hit the fender.
Where did it actually make contact with the fender? From what I can see in the photo, it looks like the top crossbar is above the fender and as the forks compress it may hit the top of the fender. What if it wound up being below the fender to begin with?
My original design, hit and bent the forks, when i ratchet straped it down to the trailer, compressing the forks. The one in the pic, is my new design, it comes close to hitting the fender when ratcheted down and compressed, but its manageable.
I have been tinkering with the design. Right now I AM NOT making these, i have too much on my plate, i have to pull my motor out and replace the stator on my bike, i have to work on both of my atvs, and i have a truck i have to rebuild before winter, and i am getting married, and looking for a new place to live, hopefully with a bigger garage so i can do more stuff and fabricating.
But if anyone is interested down the road, i will let you know when i can start making them, IF there's a big enough demand. I would like to make like 5 (or more) at a time when i do.