I understand what you are saying about the QPF bias, but its incumbent on the forecaster/hobbyists to utilize discretion in determining when a bias may or may not be at play....because automatically assuming that is the case, regardless of the circumstances, is also a bias in and of itself. In this case, we have an exotically deepening system of SOUTHERN STREAM origin availing of N Stream insert over the gulf stream. If that isn't enough to tip the scales in favor of more QPF, the EURO supports it 100%.
You need to be careful about utilizing defense mechanisms under the guise of recognition of a model's perceived "bias" to suite the interests of your back yard.