https://bbs.archlinux.org – You use EFISTUB, but does that mean you are booting via a bootmanager (Gummiboot or rEFInd), or are you using a direct efibootmgr entry?I take it you have tried to use an efibootmgr entry, as otherwise I think it would be quite obvious if you made it to a boot manager... (HowTos)