Raspberry Pi 4 and Linux/Windows devices are the only ones currently supporting HD Audio Passthrough with LE unfortunately.
Have you tried the latest Kodi with micro stutter fixes?
And also AndroidTV ROM with auto frame-rate switching support and HD Audio Passthrough, it should work much better than stock firmware.
Also see 2nd post.
You could try older LE I made in the past with vendor kernel.
Not sure if this is vendor kernel, otherwise use OP ones.
Not sure if addons will work on older versions.
Only thing not working will be HD Audio Passthrough but the other issues shouldn’t exist.
We can only hope they finish audio passthrough for the mainline kernel and LE incorporates it soon.