OBS sends at very low bitrate when using YouTube RTMPS, Fine when using legacy RTMP

Typically when I stream to YouTube I'm streaming using the legacy RTMP at a bitrate of around 6256kb/s. However when I try selecting the YouTube RTMPS, OBS is only sending at a rate of around 2200 kb/s. This is causing quality issues. Is there a known bug when using RTMPS that causes the bitrate to be lower than what's specified? I have the "Ignore streaming service setting recommendations" unchecked.
 
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