I always buy reference cards and block them, mainly as I buy on launch as I cant wait for the specialised cards to be released along with their blocks. I am a bit inpatient.
My first card will run at 2088/12,300 on stock voltages, I haven't messed with a custom curve as of yet but I will give it a punt at some point to see if I can get it over 2100Mhz, I also havent pushed the ram any further so I might be able to squeeze a touch more there. To be honest I am really happy with the clocks so any more will be a bonus.
This second card behaves the same as yours in that it never sees the Power Limit kick in, only the Voltage Limit actually thats all it ever says Voltage Limit 1. I have emailed EVGA and will be sending it back though and I will just keep the first card.
You have plenty of rad and should be able to run at lower temps than 50c, changing TIM should yield a few degrees as paste like Gelid Extreme or Grizzly will be an improvement on MX4. I have a fair collection of different TIM and Gelid and Grizzly are my favs with the tip of the hat going to Grizzly mainly due to it being easier to spread, its really nice stuff.
Your rads might also need a bit of dusting if it hasnt been done in a while, Ive knocked off a few degrees in the past due to dust build up. If you haven't already got an Aquaero then I really would recommend one along with a water temps sensor, then you can link all the fans up and control the speed according to the water temp. An Aquaero is hugely useful in controlling a loop.