I would look at what's important for you on this trip. I understand this is a first draft but it feels like a trying to see everything and you'll end up seeing nothing.

Sidenote but the car rental company will probably charge you a little for the extra driver. Hopefully gas prices aren't crazy high around October.

Hopefully you love sitting in a car and driving a lot. Day 16 is probably gonna not work out the way you want. I'd suggest writing down the total hours driven per leg and see if that's what you want out of a trip.

Except this was on I-5 going South right before the Nisqually Delta

This is how Military Friendly schools are determined. About a decade ago schools paid to get included on a list to attract veterans with GI Bill. So they created tiers of how friendly you are (at opening your check book)