Which BIOS have you flashed?
I believe you need a specific bios for your Nitro (and for every brand and model). I’ve only got Gigabytes and have no info to give for other cards. If I where to go look I’d start looking at the forums I gave you earlier!
Good luck! 
I think my saphire nitro+ was crashing when I set memory timing level to commute in more power tools. When I changed it back to 2, card is stable after modding. But less MH gain than gigabyte. It might be due to chip being samsung instead of micron variant.
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