PanSharpening RCS method output looks "granular"

When doing a pansharpening on Pleiades products, the default RCS method with default parameters outputs a result which seems blurry with grain

Both reproduced with OTB 7.4.1 and 8.1.1

PanSharpening with RCS default parameters :

Capture_d_écran_du_2023-04-18_15-59-41

PanSharpening with Bayes method :

Capture_d_écran_du_2023-04-18_15-59-51