yes i think you are correct, happy new year brotherH264 seems to be OK now too, did a couple of encodes & there's no B Frames in the recordings. If I remember correctly, not only was lookahead enabled with P6 & P7 but B Frames were being inserted even if set @ 0.
funny i cannot find this part of elements in my log file..Not with H265, check your log if encoding H264.
9:40:21.366: [obs-nvenc: 'advanced_video_recording'] settings:
19:40:21.366: codec: HEVC
19:40:21.366: rate_control: CQP
19:40:21.366: bitrate: 0
19:40:21.366: cqp: 15
19:40:21.366: keyint: 60
19:40:21.366: preset: p6
19:40:21.366: tuning: hq
19:40:21.366: multipass: qres
19:40:21.366: profile: main
19:40:21.366: width: 1920
19:40:21.366: height: 1080
19:40:21.366: b-frames: 0
19:40:21.366: lookahead: false
19:40:21.366: psycho_aq: false