My advice learn how to OC manually, a lot of these OC programs use predefined settings to achieve an OC. With a manual OC that you do, you can try to achieve the speed you want with the minimal amount of voltage you need to use and maintain the setting you want. This is the best way for you to achieve your goal.
Since there are differences in each chip so the predefined settings they use a very loose to make sure sure people can use them, where as doing this manually will make sure you get the best results for YOUR hardware.
As for your settings, never used said program or looked at it. But in general when you OC you need to put in more voltage to make it stable, and undervolting it while maintaining an "extreme" OC whatever that may be probably won't work. Plus the whole underclocking and overclocking at the same time seems counterproductive and iimpossible if I understand that correctly which I probably didn't.
But whatever you do, make sure you stress test it. If it works it works, if not change things around till it does.
And if you haven't already done so get a good heatsink.