I was only yanking your chain as the topic have been beaten to death. The yellow is fine and usually if they have a problem with it tech will usually give you ample time to correct it. In the past I know of they just have the racer make the corrections for the next round.
My advice to you is use your reasoning capabilities to make your decision. If you could see without a doubt your number as it is whizzing by you at 140 then you are good. Being legible is the most important point no matter what the size, color, or font. Yeah tech could deem many bikes ineligible due to minor technicalities, but in your case from this vantage point it looks good.
Mark