So, you could try setting the intensity manually lower than SRBMiner now does it based on your setting 0. This might work, but more likely it is in the profile you use with Overdriventool. I don't have VEGa's, but general advice here would be to cut back what you are doing there more to stock value and then see if it improves. Once you have a stable situation, crank it up.
Hope this works for you. May be somebody else can give you his Vega settings as a reference to try.
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I don't think it's related to that. I know for experience I'm not pushing them hard and Vega's immediately complain when we taken them to the limit
Maybe it's because I'm using the latest drivers that it doesn't do any shares, and I'll revert to other drivers to test it, but I'd appreciate it if someone could help me fine tune the files to run the miner properly with the watchdog, restarting gpu's at the start, etc =)