With 2,7K you are bound to lose quality.
BD supports only 2K and 4K (with HEVC).
The question is did you REALLY record in 60p, or in NTShitC in 59,940p.
Your options are either to downscale it to 2K, or upscale it to 4K to HEVC.
But your best bet is to crop to 2K, of course if your frame composition allows for that, if you have uneeded background.
As for bitrate, I don’t remember if BD supports compressed audio of GP, but you can uncompress it to 16/48 LPCM. Max video bitrate is 40Mbps, so set to standard 36Mbps.
And you’re good to go.
But next time stick with proper natural number framerate of 25, or 50 fps, makes life much easier.