As for me it's useless to increase core for ETH.
Increasing it to around 140-180 will let you lower the power limit. 1080 Ti needs around 1450-1500 core clock in order to maintain 54MH/s+ hashrate. Right now my cards are running at ~165W and ~55MH/s on Linux.
yes, those zotac mini`s will drop core to 1100mh/z no matter how much i clock it. they are on 60 tdp however. increasing it to 65 boosts a core clock well over 1300 and in that case i can normally clock mem to 600. must be something in the very design of power distribution within the mini itself, other cards run smoothly on 60 tdp.