So currently I have switched back to Windows10 1507 (ver 10240 from 2015) and This is the only Windows10 where my GPU wont get stuck at Idle Clocks no matter how much I Alt-Tab.
The versions of Windows10 I have issues are : 1607, 1703, 1709, 1803, 1809, 1903, 1909, 21H1, 21H2 (in all these...