I had the same exact problem when using UniBeast/Chimera: RMStatus: iTunes/Apple Store Content Access Problem. Install with latest UniBeast, no boot flags was flawless. First boot with UniBeast to OS X install on SSD without bloot flags, no issue. After installing multibeast/chimera 3/and basic no dsdt options, not even -x flags could get me to boot.
I'm using the GA-H97M-D3h board with an i7 4790k cpu, GTX 660 2GB, 12GB ddr3, SSD, LG Blu-ray burner, Windows 8.1 dual boot build.
SUCCESS: Latest Clover install with Motherboard set at EFI boot, newest F4 bios, and nothing disabled.
I resolved this issue completely by using the tonymacx86 guide for Clover Bootloader. Wow, what a great fix, I do have to say that it's actually quite easy and my hardware works well. I have two issues: 1. iMessages doesn't' work, but I probably need to call apple and have them unlock my iMessage account. 2. my magic trackpad gestures don't work. Other than that all my hardware works, and OS X is stable. I'm assuming that these small issues are because this is the x79 chipset and Apple hasn't refreshed to this yet.
I've run Uningine Valley Benchmark for an hour, no issues, and Handbrake has encoded over twice as fast as my old i7 920 cpu without issue. I played starcraft 2 for about an hour for good measure with no issues on ultra settings.
In conclusion, give Clover a try.