There are definitely a few parts I could see that an upgrade would reduce the weight. The front forks are steel, the seatpost is heavy, and the stem is a pretty solid chunk of metal.

Tonight I am around 1150 km. I took the wheels off and did some hub maintenance. The grease in the hubs already was ok...not great and not hugely plentiful but it was ok. What was weird was that three of the four bearing tracks had clearish white grease, the last had an odd brown yellow. Maybe they ran out and switched grease.

I bought a tube of finish line grease, got very excited about it and have re packed 10 wheels over the past few days. We will see if this improves my average speed.

Two of the wheels I replaced were "vintage" rescues, aka filthy and neglected for probably 40 years. It felt really good to scoop and scrub that filthy tar out of the bearing tracks and bearings and repack with the new grease. The other wheels had conditions between that and this bike, which was the cleanest and smoothest. It appealed to my OCD.