You are a man of integrity to post your situation, I salute you!

IMO, your temps are still to high, with the power saving option enabled.

Please try the AXTU program, you can manually adjust the speed of the CPU cooler fan, if it is not automatically changing. One of the chassis fan headers has 10 steps of speed adjustment, or the others have at least five.

The fan speed with that LNA resistor in place is if the fan is connected to full 12V power. If the fan still connected to the CPU Fan 2 header, with the LNA in between, I doubt that it really is spinning at 900 RPM.