Trip update: All went well!
The DCA-LAX portion was definitely sold out in F - they weren't even selling any tickets in F, instead forcing the reservation into Y if searching for F on that specific flight. The rest of the flight was very full, but not oversold.
Connecting in LAX was a pleasure and very easy. It was kind of cool riding the shuttle outside on the taxiway, and our Eagle flight actually arrived into SMF early. Like all said here, the connection was definitely painless. Glad travels today went smoothly!