Regarding the error rate, there have been multiple reports and multiple replies in this thread. I highly recommend ninjastic search, since you can enter the topic ID and a search term. You could even filter by author and only get posts by jstefanop.
https://ninjastic.space/search?content=error&topic_id=5340015

In short, as long as your hashrate in the pool's dashboard looks fine, everything's fine. It's overreported, basically - if it says 50% error rate, it doesn't mean the whole machine only has 50% of the expected hashpower, but it's just one of the cores in one of the 44 ASIC chips that has such a high error rate, which is within spec / normal error margins.
Something like that.