Just looked at your log, it's already @ 2 seconds not 3 as you stated.
20:02:14.987: [x264 encoder: 'streaming_h264'] preset: faster
20:02:14.987: [x264 encoder: 'streaming_h264'] profile: high
20:02:14.987: [x264 encoder: 'streaming_h264'] settings:
20:02:14.987: rate_control: CBR
20:02:14.987: bitrate: 20000
20:02:14.987: buffer size: 20000
20:02:14.987: crf: 23
20:02:14.987: fps_num: 60
20:02:14.987: fps_den: 1
20:02:14.987: width: 2560
20:02:14.987: height: 1440
20:02:14.987: keyint: 120
Muxer errors & NDI is wrecking your audio too, real fast....
20:02:14.991: [FFmpeg aac encoder: 'adv_stream_aac'] bitrate: 160, channels: 2, channel_layout: 3
20:02:14.991:
20:02:14.991: [ffmpeg muxer: 'adv_stream'] Using muxer settings:
20:02:14.991: method=PUT
20:02:14.991: http_persistent=1
20:02:14.991: ignore_io_errors=1
20:02:14.991: http_user_agent=libobs/27.0.1
20:02:14.991: hls_time=2
20:02:14.996: ==== Streaming Start ===============================================
20:02:14.996: [ffmpeg hls muxer: 'adv_stream'] Writing to path '
https://a.upload.youtube.com/http_upload_hls?cid={stream_key}©=0&file=out.m3u8'...
20:03:52.718: adding 213 milliseconds of audio buffering, total audio buffering is now 213 milliseconds (source: Mikro)
20:03:52.718:
20:09:19.746: adding 64 milliseconds of audio buffering, total audio buffering is now 277 milliseconds (source: Mikro)
20:09:19.746:
20:11:32.642: adding 128 milliseconds of audio buffering, total audio buffering is now 405 milliseconds (source: GamingPC)
20:11:32.642:
20:13:24.570: adding 362 milliseconds of audio buffering, total audio buffering is now 768 milliseconds (source: GamingPC)
20:13:24.570:
20:15:12.267: Max audio buffering reached!
20:15:12.267: adding 192 milliseconds of audio buffering, total audio buffering is now 960 milliseconds (source: Mikro)
19:52:20.664: Loaded scenes:
19:52:20.664: - scene 'Stream':
19:52:20.664: - source: 'GamingPC' (ndi_source)
19:52:20.664: - filter: 'obs-ndi - Fix alpha blending' (premultiplied_alpha_filter)
19:52:20.664: - source: 'Mikro' (ndi_source)
19:52:20.664: - source: 'Discord' (ndi_source)
19:52:20.664: - source: 'System Info' (text_gdiplus_v2)
19:52:20.664: - source: 'Display Capture' (monitor_capture)