FFS, THAT IS YOUR PROBLEM . The fans are SUPPOSED to be on when the airflow is insufficient you mongaloid . If you had your fans on single stage, they would keep temps held at no more than a MAX of 93°C and would actually BRING the temps down and just keep cycling on and off. The first stage of the two stage set up is not man enough to do this and the second stage doesn't come in until 100°C . With both fans enabled, problem GONE .

Can I just say - you're a TWAT .