I'm not a fan of AI suite and haven't used it in ages so, I'm not going to be any help with that. My preference is to OC in the BIOS...but that is not to say you shouldn't use the autotune software...it's whatever you feel comfortable with and what works...
I wonder about your RAM though....is it running at rated timings? I don't know if AI suite takes care of that.
If you go into BIOS...extreme tweaker tab there should be an entry AI Overclock Tuner...and there should be a DOCP selectable profile to run your RAM at rated speed and timings. You could use CPUz to check what your RAM is running at now...Memory tab and SPD tab