93°C is way too hot to be normal for an R5 2600. The stock air cooler that ships with your CPU should be able to manage lower temperatures than that.
Things to consider and check:
Perhaps your radiator isn't mounted optimally. Is any part of it blocked from getting proper airflow?
Are any of your fans mounted in opposing directions, running too slow, or pulling when they should be pushing, or vice versa for the radiator position in the case?
Your pump may not be primed properly and therefore not adequately circulating coolant.
Did you use enough thermal interface material between the cold block of the cooler and the CPU's integrated heat spreader?
Is the cold block incorrectly mounted and making insufficient contact with the CPU...