1) Encoding DTS >1536kbps produces tracks with no audible output. Not surprising 'cause I think this is about the DTS limit.
2) When I make EAC3's over about 1000k, or any TrueHD, a lot of players I have show problems with playing the files (they crash, hang, freeze, etc). MPC in Windows can play the files OK. Just other players can't, and maybe don't like decoding them IDK. If you don't see any obvious problems, maybe there's none... i.e. maybe it goes back on FFmpeg.