If the bottom mixing is too strong, you can adjust this. This is a good value for open ocean, med sea outflow, but in coastal region, a better value should be 0.02 (according to brandon):
BBL_EFFIC = 0.2 ! [nondim] default = 0.2 ! The efficiency with which the energy extracted by ! bottom drag drives BBL diffusion. This is only ! used if BOTTOMDRAGLAW is true.