PFC capacitors only affects the amperage that the ballast consuming from your electricity company, not its wattage losses.

You’re charged on the wattage though?

My understanding of it is that at home, as a domestic consumer, you are charged on true power which is the wattage with ballast losses the fitting draws, not taking into account the power factor. A poor PF will result in a higher apparent power and increased current draw, but you are only charged for apparent power for industrial/commercial consumers hence why power factor matters more in those applications than at home. Always good to correct PF though as it will reduce the current draw through your cabling regardless on whether you are charged for it or not. I'm sure someone with a more in depth understanding will chip in later though
Looks like this is measuring the true power so just the lamp and ballast loss without taking the PF into account. I've also got a little plug in power meter that seems to only measure true power too as connecting an LPF fluorescent fitting to it reveals only the expected lamp wattage and ballast losses without any penalty for the poor PF.

This also has a PF setting, it was about .30 something if I remember, I’ll have to measure it again? I must admit, I’ve always thought the cost charged was on the gear losses?

Ah ok Would be interesting to see how close to unity you could get it with various capacitor values added Yeah at home you aren't charged for poor PF but will still pay for the gear losses as in the 10-15W of heat from the ballast which makes it up the the 80W or so seen here