As a net exporter (or net generator as PG&E calls it) did you receive some credit for those surplus exports? Did your $8 true-up adjustment include a small surplus export credit?
I am a net importer, so things are different. My first full year NEM2 true up was last June:
Cumulative energy charges showed me owing $357,
NBC's totaled $191.
Minimum Monthly Charges already paid totaled $124.
From this, we would expect I owed a true-up adjustment of $357 - $124 or $233. That is not what they charged me. Instead, they calculated based on the NBCs, so it was $191 - 124, only $67. This anomaly was discussed at length in another thread:
PG&E NEM2PS True-Up Calculation? It remains a mystery, so I am waiting to see what they do this year.
Export Everything and Grid Charging (for cloudy days) are my normal settings, though this year I am trying to do as much car charging durning the day as I can to reduce NBCs.
I do wonder about the difference between your results and mine. Your solar is a bit bigger, but also I have tall trees to the west, so there is substantial shading and reduced solar production. Also, with just one PW, a fair amount or our export is during off-peak rate period, before 3 PM, so we get an NBC hit on those kWhs. A second PW would let me time shift much of that export to peak pricing, getting more credit.
(I do wish I had installed 2 PWs, but Export Everything was not an option back then. Now, investing $10k to save $68 a year (or whatever they decide to charge me this year) is tough to justify.)
Tesla App says my solar produced 7,187 kWh in calendar 23, 20 per day on average. The car charged 3,996kWh at home (doesn't include supercharging), around 11 per day. The net PG&E in that true-up was 2,759kWh, so the house uses roughly 5,950 or 16kWh per day. Is this profile similar to yours?