Your idle temps are great! Mine always idle around 45c.
I plained my heatsink surface on my cpu b heatsink it seemed to stabilize the temps just a hair better. Approximately 2c less under load same idle.
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Next I’m going to thermal calibrate it and I’ll experiment with the air cooled fans to see if they make a difference as well. I am still using the 7 blade stock quad rear fans vs the 3 blade deeper air cooled fans. Theoretically I figured the 7 blade would be more beneficial in the tighter quarters because it creates more static pressure. On the air cooled ones they have their VRM heat sink on the side and have a lot more open space with only 1 CPU which would make airflow way easier. Hence the low static pressure higher airflow 3 blade fan. I report my experiments once I try!