From those you mentioned I only has 97W Ku . My X2 Mini seems to play the video/audio fine and sync is OK on REVN and Retro. Maybe you could try rolling back and forward the firmware to get rid of any bug. Always doing a Factory and a hard reboot after each installation. I have no idea why yours is out of sync while mine is OK. Maybe a firmware issue as you mentioned. Is getting hard to keep contact with X2 lately tough.