Since this is in WA the officer will not show up unless you subpoena him which is generally a bad idea. You have a problem that the officer states that you were doing 55 both in approaching him and after you passed him. Even if you get the reading from after you passed him excluded you still have to deal with the reading from when you approached him. The officer states he was using the rear antenna when you were approaching him but is silent about which he used after you passed him. Your other issue the standard for conviction, it only requires preponderance of the evidence, not beyond reasonable doubt. That lower standard is really hard to overcome unless you can get radar excluded. If you post the complete statement from the officer, calibration certificates, etc., it will be easier for the group to find issues that could lead to SMD exclusion and an acquittal. There are details the officer has to address in the statement which can lead to a dismissal if the i's are not dotted and the t's not crossed. With the information provided so far it is not looking good for you.

