I have no problems on mosfet with 12v driving single 9mm 445 Nichia or single 1W 520nm at full power.
However mosfets are attached to main big heatsink baseplate with fans below.
Those Mosfets are capable of this and much more, but big!! heatsink is required.
Are you testing CW full 5v modulation? Try with Dac, overall power is less due pulsed modulation.