Those things I listed are minor. If you're serious about it, you could buy the 11 inch wide tires first and try them in the front. Then you could make your decision on whether or not to use 9 inch in the front.
I'm guessing it's not a big deal but I thought those things are worth mentioning. I run 10" wide in the front and it seems fine.
I was actually just going through your build thread (for about the 1000th time. Lol) looking to see what size tires you are running. I assume you are running 10's front and back? You also have the 1" spacers in the back to even out the width?
Also, one of my concerns of going with 9's in the front and 11's in the rear with the same size wheels on all 4 would be that the fronts would be slightly shorter than the rears due to narrower tires being on the same size wheels.