Hey man
Your temperature is badly high and is dangerous for this type of card
Once i had a problem with cooling for couple of days so the temperature of my Vegas raised up to 65 degrees and more
I got many errors in SRB such as BUS ID COMPUTE Error, Low Difficulty Share and etc.
But with 50 and lower degrees there is not even 1 error.
Try to increase FAN RPM to 3300 and more
Also your overclock option is not good
Send me a PM, i will give you my numbers to use with OverdriveNtool
Bad overclocking causes high power usage, high temperature and will damage your cards
Try to use 18.6.1 Adrenalin driver, i think its the best compatible version with SRBMINER
Just try to keep them cool.
Here are my results without TWEAKING
https://imgur.com/a/mnYohLR