Just waking up this thread...
I just got myself 2x of these sweet monitors. These are connected to an Asus Geforce GTX 970 STRIX - one via HDMI, and the other via Display Port (my primary).
While I love these new screens, I can't seem to get them above 67 Hz.
I first tried in the Nvidia control panel just to test it, and they wouldn't let me exceed 67 Hz.
So then I downloaded the CRU as this program is the one being used in this thread, and followed tutorials on how to use the program, and I even copied your screenshots (were these the "custom timings"?) into my new resolution profiles with 70 Hz (as a starter).
I then rebooted my computer and headed over to the control panel to try out the new framerate, but the new one isn't even listed among the various Hz - I only have the 50, 59, and 60 Hz rates to choose from.
Also, the "Hide modes that this monitor cannot display" is greyed out if that's helpful info.
Asus X99-A w/ BIOS 3402 | Intel i7 5820k OC @4.4GHz 1.28V w/ Noctua NH-U14S | 16GB Corsair Vengeance DDR4 OC @2666MHz 12-14-14-28 | Asus Geforce GTX970 STRIX OC | EVGA 750 G2 750W | Samsung 850 Evo 1 TB | Windows 10 64-bit | Be-Quiet Silent Base 800 w/ Silent Wings | 2x Dell U2414H OC @72Hz w/ Display Port