21:10:41.694: Output 'adv_stream': Number of skipped frames due to encoding lag: 7 (0.0%)
21:10:41.694: Output 'adv_stream': Number of lagged frames due to rendering lag/stalls: 13594 (5.7%)
21:10:41.694: Output 'adv_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 1516 (0.6%)
Reduce ingame FPS, mainly by VSync.
Your 6000 kbps bitrate is too high for your connection, maybe. 1280x720x30 FPS ---> 2500 minimum , 3000 good , 3500 very good image.