Hi, sorry for taking a while to get back to this. I think this thread can be closed. I have talked to xeraa at Slack and one part of the problem (the not receiving of logs) was fixed by upgrading to 8.5.3.
The CPU/Mem usage was still high, but I managed to narrow that down to the Filebeat registry growing endlessly when containers are being restarted inside a pod. Created a separate issue about that here.