From your last log, the CBR recording:
22:45:45.421: Output 'adv_file_output': Number of lagged frames due to rendering lag/stalls: 255 (1.1%)
22:45:45.422: ==== Recording Stop ================================================
22:45:45.422: Video stopped, number of skipped frames due to encoding lag: 1572/22654 (6.9%)
The CQP recording:
00:37:14.709: Output 'adv_file_output': Number of lagged frames due to rendering lag/stalls: 768 (0.8%)
00:37:14.709: [ffmpeg muxer: 'adv_file_output'] os_process_pipe_write for info structure failed
00:37:14.716: Video stopped, number of skipped frames due to encoding lag: 2112/54771 (3.9%)
Lagged frame percentage is going in the right direction. But, now it's right in the range where you could be getting lag from the rust drive not being able to write the data fast enough.
Correct view for Task Manger, what's up with your HD's are you using RAID?