I drive 40k miles a year for work too, and average a ticket every couple of years. My recommendation is to call the court clerk and ask if you can talk to the prosecutor directly. It’s rare, but I’ve been able to do that and they will give a reduction after I explain what happened. If you can’t talk to the prosecutor, ask the clerk what local attorney they recommend you hire. Call the local attorney and they should be able to tell you exactly what reduction they can get and what it will cost. I suspect your not going to reduce the cost, but you want to get this off your record as a speeding ticket otherwise your insurance company may come across it.
Good luck.