The system set-up I am using currently is Aurender X100 > Modded L.K.S DAC > AMR DP-777 (Pre-amp only, not using the DAC) > DNA Stratus Headphone Amplifier > Sennheiser HD-800.
The Stock LKS DAC before modification was very detailed and had good dynamics and soundstage. Overall it was a pretty good DAC for its price, but I found that it was still a bit harsh and unrefined partly due to the Sabre 9018 chip signature.
Yes, I believe the Mytek is fully burned in now. I left it running continuously for 10 days to be sure. When I received my modded DAC and first listened to it, I was kind of shocked. Your mods seemed to have killed that beautiful bass section, everything sounded tight and very restrained.