Lukemac: What is the SB-V score? And why does it matter. Clearly he's doing well. Being gifted does not mean they are perfect, they never need help or guidance, or that they will do a task because the teacher thinks it's important.
I'd never encountered the timed tests until DD was in 3rd grade and I volunteered in the classroom. Not sure why this emphasis on speed is important.
Dh & I learned the hard way that school shrinks are often not gifted advocates. For a truly independent analysis of your child, you need to seek a professional outside of the school environment.