No... that's not worth mentioning. Neither is the defense you have thought of as you would have to prove that by competent authority... which you are not.

The first thing you should do is a search for 22350 defense on this site. There is a lot of good info. Second, you need to get a copy of the speed survey for the road you were on to see if you have a good speed trap defense. I'd bet that the odds are in your favor that the speed limit is unjustified.