ERROR piecestore upload rejected, too many requests

Wow, I’ve never seen anyone actually reach thresholds that high. That’s not a good thing, your node is clearly not able to handle those requests as fast as they come in. You’re most likely also failing almost all uploads and a good chunk of downloads. This is exactly why this concurrency limit exists. To make sure your hardware isn’t overloaded. I created a post a while ago outlining how to find your perfect value. In your case there may even be a benefit of lowering it below the default.