You are running a pretty hot voltage at 1.49, 1.5 is the recommended do not pass mark i think.
Nothing wrong, but it could lead to less cpu longevity. I would drop the voltage back to 1.45, but thats just me.
Are you running liquid nitrogen?
Not sure I understand your issue, is the system stable or not? If it's stable, you have a good extreme OC. If its unstable just back off until it's stable, then you know your limits.