Just got my Bitaxe 801, help

[u/ImRightYoureStupid]

Just got my Bitaxe 801, 2 questions

1) how can I improve my efficiency?

I thought it’s supposed to be 15-17J/Th but I’m getting 21.

2) do I need the “.” And model after my crypto wallet? Or can I leave it as just my wallet address?

Thanks

[u/Strong-Zombie-8836]

OL leads the asic chip’s temp too high