Obviously here and there are problems with the standard MIUI music player. IMHO, I can recommend a very basic and lightweight alternative: Music Folder Player (https://play.google.com/store/apps/details?id=de.zorillasoft.musicfolderplayer&hl=de)
"normal" TWRP wipe means the built-in function of TWRP to wipe: is includes Dalvik+data+cache wipe. IMHO the stable is what is says: stable. If it really is better for YOU I cannot say... I use third party apps for music and browsing and I do not have any problems
Maybe OT, probably a Google issue: even after having changed the device (from Mi2s to Mi4c) I cannot use Google backup and restore as the account is greyed out (see screenshot) Any ideas anybody?
Give him the time he needs... It may be a bit contradictory if we ask mainly for a ROM that is primarily stable on one hand and ask again and again for releases on the other...