I changed the original heatsink/cooler as it was damaged during transit (the flat copper base was no longer flat), but even with the new heatsink temps still reach 86.
Is the heatspreader of the chip still flat? If the cooler was actually damaged while mounted, its reasonable to assume the flimsy alu heatspreader got dented or slightly bent too. Its even possible the heatspreader is no longer making proper contact with (all) the dies. I once had that with an AMD CPU, no matter what cooler I put on it, it would overheat, badly. removing the alu heatspreader solved that. Not sure Id be so brave with such an expensive miner where there are 4 seperate dies under the heatspreader, but I wouldnt mind seeing the pics if you decide to try
