I second that with regards to the reduce auto fan speed. I have tested it on a batch 1 17Gh D3 and I have rolled back to stock for the time being.

Problem I have:

1) Following your instruction and setting speed at 400 and fan at 25% is risky. The moment I upgraded the firmware my temp went up to 80. I will suggest setting the fan to at least 59% (if ambient temp is around 20 degrees) or higher if your ambient temp is much higher.

2) I tested with lowest, 1,2 voltage at 487 and I am not getting and HW errors but it keeps stopping with no hashrate.

3) You dev fee pool keeps kicking in when I'm trying to test with different settings and it is better if you set it so that it kicks in at the end of the hour or so.

4) Maybe a way to manually tweak the auto fan speed will be useful.

5) A temp protection like the L3 can also help.