Very interesting bugcheck on that one, haven't seen it in a very long time. It's the CRITICAL_STRUCTURE_CORRUPTION 109* bugcheck. Interesting enough, yours are STILL pointing to memory corruption, so at this point I would be very surprised if this is software related.
I would continue testing with memtest86 and run a system file check. (type cmd in search>right click and run as admin>sfc /scannow). This could also be a power supply related issue, or heat related, but I still feel that your memory is the culprit here, or possibly even the board. To best diagnose this, I would test EVERY stick individually in EACH DIMM slot to ensure both your RAM and board aren't the issue here. This will take time, yes, but it will also give you a definintive answer as to what's causing your issues.
For example, one of the sticks shows memtest errors in slot 2. You remove that stick and put in another stick, and after 6 passes this test shows no errors, you know it was the stick. Another example, memtest shows errors in slot 2. However, this time when you remove the stick from slot 2 and test another stick, you still get errors, it mat be a bad DIMM slot.
It's also very important to make sure your DRAM timings & voltages are factory advised and not different.