Hrm, it's strange for 1060 to have 100 watt as minimum but it's possible. If that's the case, nvOC and linux in general won't be able to set lower PL if the GPU won't allow it. The only solution would be to flash vbios from another model of 1060 which involves the risk of bricking your GPU... if you want to take the risk google "vbios for GTX 1060". There are tons of other forums that deal with flashing GPU's and I've seen lots of people reporting succesfully flashing vbioses from asus to evga, from msi to zotac, etc. Do your research.