The cable is driving me insane though, its so thick that it won't coil up easily.
Sailors know how to coil rope. Cable is the same.It might be that it is being twisted as it is being coiled up. You might need to 'rotate' it lengthways to stop the twisting. I used to have this with my public charge cable until I noticed that if I let it untwist as I wound it up it would be fine. Try coiling it up from the wallbox end first and allow it to untwist as you coil it up.
Grab a sailor to show you how