Thank you for the helpful replies. I did indeed have further defense. The officer did not come prepared to justify the use of radar (i.e. he did not have a speed survey). Here is what happened, and why I think I have a good case:
When the officer stopped me I asked him if he knew the 80th percentile speed for this stretch of road. He said at the time that the 80th percentile didn't matter as it was a School Zone (it's actually probably not a true school zone because the school is separated from the street by a fence).
At trial I asked the officer to produce the speed survey. He again stated that he wasn't required to because I was charged with driving over 25mph in a school zone. I pointed out that my ticket didn't say that, but rather was a standard VC22350 Unsafe Speed for Conditions. At that point I motioned for a dismissal due to lack of foundational evidence. The judge asked the officer why he hadn't charged me with a School Zone violation, and the officer said this was the way he was taught to write tickets. The judge then called a recess, informed me that she would render a decision in "two weeks" and I never heard another thing about it until I got a letter from the court finding me guilty (2 months later).
I will endeavor to Appeal, and then ask for dismissal in the interest of justice if my appeal is granted. Seems like a pretty clear case of a judicial error. In the event of a retrial I do have a defense against the school zone infraction, as I do not believe this stretch of road meets the criteria for a school zone.
Any further advice would be greatly appreciated, and certainly anyone who can help advise me on writing the appeal, as well as the whether I should get the full transcript or use a statement on appeal. Thanks again.

