In Smkns screenshot his airplane is not at full speed for that altitude. All Im going to say.
Unless this is some joke I'm missing all I'm going to say is that it doesn't matter that his plane isn't at full speed. His calibration is perfect yet the training bombsite is showing his main site is off.
When I fly any bomber, B29's included, I always throttle back once I reach the altitude I want to achieve. I only run full power when I'm under attack, climbing, or just wanting to get home.