bootloader for raid 0 array

[apple tech geek]

so i've just got sierra to run very fast on my dell latitude e6540 in software raid 0 (read and write speeds over 900)

now from my tests so far i can install a bootloader on the drives and get the bootloader to work and detect both drives 

but when i boot the apple logo appears with no hdd activity and a no symbol at about 50% of the bar 

now if i boot the array using the installer usb and select one of the drives it'll boot fine

is there anyway to get it to work normally or a janky bypass? i've already tried to make a 5gb partition and raid the other 2 remaining partitions so 1 drive as a extra partition but it doesnt seem to boot from that partition

i've already copied the all the efi partition contents to both drives