It should be easy to determine if the converter setup is causing the delay.
1. Connect Roku directly to the Sonos.
2. Connect the Blu-ray player directly to the Sonos.
If configuration 1 and 2 perform without delay then there is an issue using the TV optical out.
But whether the problem is...
You're voted off the island, psycho.
The knife is long enough to slice both apples in half with one stroke.
Everyone gets half an apple, the problem doesn't stipulate both apples need to be completely eaten.
You can remove the tweeter after removing the fasteners securing it to the cabinet but I think you'd be better off finding someone experienced in speaker repair.
Agreed. I gave Season 1 a shot but very little resembled the books. Gave up about half way through Season 2 Episode 1. This isn't the story I'm familiar with and I don't think it will get any better.