Hey there!
First of all, thx for your affort to get this little thing running! I just got mine, and the first thing i noticed was that it is bended... just a little bit, but nevertheless recognizably bended. am i the only one?
EDIT: my orange pi one seems to have the same overvolting/overheating problem. i would try to measure v12c with my multimeter... but i am not totaly shure how...
EDIT 2 : i measured 1,122V in idle and 1,340V under load