Well, you know what? I screwed up by doing this, and I ended up doing new install, anyway....
The problem is that I couldn't fix the UUID of the RAID efi partition, I was supposed to manipulate with the hex editor, but I wasn't prepared and was too lazy to do, so I gave up on it. efi itself was successfully created and mounted on md raid alley though.
What I did instead was I installed /boot/efi on USB stick and things are working perfectly. I had failed doing this several time prior to this but by doing "force installing efi on removal media" things are working perfectly. I choose graphical expert mode to do this.
Now I copied this usb stick and keep it as back up.