After reviewing submissions from each club, the NRL said the original breaches had stood, but that it took in to account that last month's indiscretions were their first such offences, when considering the suspended sentences.
The Knights said they were now assessing their options. "Despite the reduction, the club remains disappointed and will now consider the appeal process," a club statement read.
Meanwhile, Gold Coast Titans chief executive Graham Annesley stopped short of accepting the punishment, and said he would speak to the board before making a further decision.
In a letter to the franchises, NRL chief executive Todd Greenberg emphasised they had not questioned the integrity or professionalism of their medical staff.
"We acknowledge the difficult job they face in the modern game and we are exploring ways to provide more support to our medical officers."
But Greenberg said the tough stance had to be taken and he had been pleased with the competition-wide response since the original sanctions were announced.
"All clubs have acted responsibly to remove players from the field for head injury assessments and we hope and expect that will continue," Greenberg said.
