Dell XPS15 Dual-Boot Problem

I have a new Dell XPS15, I replaced the HD for a 250GB Samsung SSD, it also has the 32GB cache with Intel Rapid Storage Technology. So I disabled the IRST, switched to legacy boot and replaced the HD, then installed W8 to the 250GB drive.

Problem: I installed Ubuntu as dual-boot and selected the first option to run alongside W8. In retrospect I think I should have manually set up dual-boot as a better option using EasyBCD. The problem is that when installing Ubuntu I was never given the opportunity to determine the partitions like it said I would be give in the install notes. Ubuntu has appeared to have installed on the 32GB cache drive. 

So to fix I then started again and reinstalled W8 to the 250GB HD thinking it would somehow remove Ubuntu form the cache as I want to use that for the IRST as the laptop did from new. Problem now is that when I try to boot from UEFI, it goes looking for Ubuntu and I get the grub error. I can boot without problems to W8 using Legacy.

If anyone knows how to remove Ubuntu from the 32GB cache and reactive the IRST and allow it to boot from UEFI again that would be much appreciated. I'm totally lost. I'll then reinstall Ubuntu using the manual partition method.