No worries, you are missing an “and” predicate.
sudo tcpdump -w test2.pcap -i en0 -s0 host xx.xx.xxx.xxx and port 8065
Regarding why it’s too low, it would be very hard to say. I would suggest to try without -w and confirm you are getting the output correctly. If nothing is showing, then remove the host and check. Basically try eliminating variables one by one until you figure out the issue.