980M Blackscreen on 84C+

Hello people,

Background - upgraded GFX module around March 2016 with new heatsink and thermal pads, had to use the upgrade kit's low end pads on the back on one vRAM stack, another one from my old heatsink (860M from Oct 2013) onto another vRAM stack on back. Next is I ran quite good AAA titles but sometimes temps went past 80C don't remember exact nos & It was fine.

Issue
Now after a long break since April, this month I started AAA with pending Bo3 before it was Dota2 mostly, after a quite long time temps went upto 85C and first encounter with blackscreen had to power shutdown did a repaste immediately but later didn't put that much of load without AC and had to perfrom an OS wipe didn't test Bo3 but Technomancer maxedout and after quite a time faster the temps reached 80+ and upon 84C couldn't see the 85C number but I'm pretty sure that It reached that point blackscreen agai, Replicated same with Heaven maxedout too, Panicking I repasted 2 times in which the last repaste was a clumsy one which caused scratches on the GPU core / too much alcohol waste seeping into the mobo caused removal of the mobo film and dry it out (yeah, dumb asf), removed that Blacktape since some fine lint got stuck, thought that might be the cause. But now after that messy TIM job and hassle I din't bother to test again past 84C mark, Afraid I might fry the GPU. Side note - waiting for a few components to finish off my U3 mod.

A helpful person Solo wing (M17x R4 with 980M owner) said his card also did sometimes blackout with 73Cs on high load due to MOSFET overheating and no repsate helped until fujpoly pads helped to sit at 67C and no issue since then.

Is Maxwell really that bad or something wrong here ? I'll proceed to order this Fujipoly and some extras for a better TIM job, Posting this so that I may learn something that I didn't knew & might be of much help in fixing this. Any tips / thoughts are welcome & much appreciated.

Thank you very much for your time & Patience.

P.S : To mention yest I noticed the card fans were not on on normal load no game, temps went upto 85C and system didn't put that blackscreen, Immediately I turned the fans on.
Also no OC /OV, Light benching for Driver testing.

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980M Blackscreen on 84C+