Unable to install Windows 8.1 via Boot Camp

Hi!

Firstly, i apologize because of my English.

I have searched all questions and answers about "We couldn't create a new partition or locate an existing one" and i have been trying all recommendations since a month. After all sleepless nights i have gain nothing.

My problem is this: I had installed Windows 8.1 via Boot Camp and i was working fine. I tried to upgrade it Windows 10 according to windows instructions and it's done. But my drivers did not work. I tried to install latest Boot Camp drivers, but it didn't work. The i decided to uninstall Windows 10 via Boot Camp and achieved it. Later, i wanted to install Windows 8.1 again. But as you guess it fails: "We couldn't create a new partition or locate an existing one."

I have iMac 27 late 2013 with 1 TB fusion drive. I tried to delete logical volumes, create again, merge etc. Every time, i got this error. I am not familiar with terminal but anyway i tried. Even tried ta separate fusion drive and install OS X Yosemite on only SSD and install Windows on only HDD. But i didn't work again. Once i completely destroy fusion drive and let Disk Utility to restore it (that red message and fixing after it). Nothing did help.

I want to install Windows 8.1 via Boot Camp again.

I have bootable OS X Yosemite USB flash drive (so, i am volunteer to do your advices)

I also have bootable WINISTALL USB flash drive that created by Boot Camp.

I now use OS X El Capitan GM Candidate on my iMac.

PLEASE HELP ME. THANK YOU.

My diskutil cs list is:

and my diskutil list is:

Disk Utility: