alrite. first i need to correct myself. i previously said that the memory clock readout in GPU-Z's sensors tab was for 2GB of memory, i forgot that with a stock bios the sensors tab shows the same as the main GPU-Z tab. so in your case, just multiplay your memory clock by 4 to get your Effective.
anyways it looks like your card is wanting more power and voltage. looking at the last image of afterburner you posted your already at the stock bios limit of 110% power target, so your not going to be able to do anything about that unless you get a custom bios.
as for the voltage you can try maxing out your voltage slider(this wont hurt anything since your on stock bios and it will limit you to a safe value). however, by upping your voltage your going to increase heat, and seeing that your already at 71c you might bump up toward 80c and then youll start seeing instability from the temps...if its not already cuasing problems(thermal throttleing starts around 65c). id say give adding some voltage a try and if that doesnt yield you any gains then simply back it down to stock voltage and start reducing your clocks untill your stable again and that will be your limit on stock bios unfortunatly.
if you want to push your clocks harder i recomend going here
and requesting a custom bios for your card.
also if you would like to recieve better, more frequent help i cant tell you how much i recomend going here
youll find all sorts of answers and the 970 crowd is very good people just looking to help each other out to reach their cards potentail.