Feel like 360 should have more power

If you get 6 spark plug testers to 'look' at a plug to determine how the engine is running, you will get 7 different answers.......

Without knowing how long the engine was run, at what throttle opening, what load, how quickly the engine was cut....then it is nothing better than a good guess. And that is not factoring in the differences in today's fuels.

Those plugs look fine to me & not causing any problems. If they were black, sooty or wet......
But they are not.