Audio Sync Issue with Passthrough

[C]

Hi there, 

I am experiencing small audio sync issues when playing 7.1 dolby atmos surround sound files via Nuvio (Premiumize/Torbox). 

I have audio passthrough set to "Full" and the engine set to Vimu. Is there anything else I'm missing?

My setup:

Nvdia Shield

Sonos Beam gen 2 / Era 300s / sub

Hisense U7 w/ audio extractor from Nvdia shield direct to sonos soundbar.

Thanks in advanced