Hi Gillian,
I hid the wire by running it under the back part of the bed (in the boot) but then running it up the back wall with a bit of duct tape (silver to match the grey wall) and so far haven’t had any problems with that. This is a retrofit and so I didn’t want to put holes anywhere. You can use those removable tabs to tie the wires up too.
The new size was designed to have a bit of extra wire between where the lights go from the lower level to the bed level. I can’t see what you’ve done but I can only guess that this is where you’ve found extra length? You can tape any excess down here.
Best advice is to work from the middle back. But ours are great. If you have any problems just speak directly to Saul at Aten Lighting and send him the exact measurements you want.
Thanks,
Lizzy