@onion, what are the two chips that get extremely hot? Could you post a pic please?

Also, did you do the 1.7v mod AND the 100k mod at the same time? I bet if you did that it was the 1.7v through the core that did more damage than the 100k mod. If not, then I think its important to figure out if you did anything wrong or if the mod isnt needed on some cards.