Well since no one commented I will give an account to you

Hello, I recently got into mining and bought a Gigabyte gtx 1080 g1 gaming edition to mine with
I have the following question, after playing with the card i can see that if I under volt it by lowering the power limit and overclock it by adding to the core and memory clock (http://prntscr.com/gd60ja)
I get better performance than just having the power limit set to 100% and no overclock at all.

And that is normal to some degree you lower the power limit but you overclock it so it runs like the power limit is not lowered

But the weird part is that it doesn't just run the same way, When it's under volted and overclocked it runs cooler and consumes less electricity as well.

Am I doing the right thing with that "under-volt overclock" combo, will my card live longer since it is cooler and consumes less electricity?

Thank you for your time.

It is pointing to zpool with auto profit switching and no zpool doesn't support Ethereum so why did it open in the first place?
Also i have another question why is it mining on the equihash algorithm when there are many more profitable algorithms(supported by zpool)
and why is it telling me that im gonna make 4.43 euro/day when the most profitable equihash coin is worth 3.81 euro/day

Any idea why this is happening??