Starship had an empty weight of under 100 tons. Of this, less than 12 tons is accounted for by the engines, meaning the empty CG is almost halfway up the ship. Belly flopping makes sense for such a vehicle.

Starship is supposed to be able to make atmospheric entry with a 150 ton payload in the nose. Wouldn't this shift the CG way forward and make belly flopping impossible?

Most of the depictions of entry I have seen show the ship pitched up 45°. Would this really be enough? I would expect 15° to be a more likely for a fully loaded ship