SO, I had the same issue. I have a 32 inch that I just purchased. I did an optical cable to a MEE bluetooth converter and linked to my Bose speaker. All runs through my Apple TV 4th gen. I had a serious delay. All set to PCM and the audio delay adjustment was at 0. Still the issue persisted. I discovered the Apple TV has a Wireless sync feature. I went through the simple proceedure and it is perfect now. If you can run all of your apps through an Apple TV, this should solve your problem. I spoke with the techs at Bose and they told me the think as you all know - there is always delay when going wireless. Just need to have the tools to deal with it. Also I am told that the newer wireless sound bars have an additional audio delay setting built in. I do not know this for a fact, but if you are considering buying one or have one - might want to check.
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