@spacecase I've tried a few spot checks during active sessions over the last few evenings, but my testing was limited. After experiencing what might've been disruptions of session stability when I disabled 1:1 NAT, I quickly reverted back to my baseline configuration.
Forwarding the configured UDP ports at the router doesn't seem to make a noticeable difference, which seems to be consistent with the alternate configuration approach at this link.
https://forum.jamkazam.com/showthread.php?tid=1371