Don't get me wrong, I know there are benefits, I try and lift twice a week. The other thing cyclists should do is try and run now and then. Both to try and maintain bone density.
Do you mean normalised power? If so, I would be interested to know if anyone else is that far apart? My 100km on Saturday was 263W normalised, 271 20 min and 255 30 min.
The numbers generally look reasonable and I would imagine gradually the weight will go

(I guess be careful on the days you're not monitoring intake. Whilst it's hard to overeat if you've burnt 2,500 cals, at the same time it can also easily be done

)
**EDIT** I've just looked at my Sunday ride, on a bike
without a Power meter and the numbers look more like you've got. Do you have a power meter?
**EDIT2** Also looked at a ride with a big climb (25 min climb) and it spreads those numbers, but I guess that's to be expected as the power wouldn't be as evenly spread over the ride.