Sounds like you may be close, a hour of prime is good but as you know you should test much longer once you think you are fully stable (12-24 hours)
I would think to resolve your BSOD issue, and get fully stable you may need more Vcore, QPI/Vtt, and a bit more than stock PCH. You may also need to set your Vdimm to 1.66
Since you are underclocking your ram you can use better timings, maybe 787-20 or 888-20 at least.
I do recommend you do not use XMP, and set each channel by itself using Expert instead of Quick