Lets  gooooo

Here's where we're at after upgrading a bunch of stuff and regearing a bit better. 1 key UltraNightmare.

i

Ok,  now that is impressive.  

Impressive.
Can you show us the stats/mastetries of your champions?
Speed ​​especially 

Sure!

Fast Tower

i

i

Seeker

i

i

Fayne

i

i

Slow Tower

i

i

Kreela

i

i

i

Hopefully that helps! Deadwood Jedi has this speed tune on his website under Batman Forever. 

Who  do  you  have  tanking  the  stuns?  Kreela  or  fayne?

Fayne tanks the stuns. Kreela is too important with her Crit Rate buff. As you can see, I only shot for 70% crit rate, enabling me to pump the crit damage and other stats up. :D

I  hope I can Someday get to This point. I Have a Long way to go

It isn't quick at all but you can do it!

I'm building myself a new CB team, doubt it'll be as impressive as that (mainly because I currently have none of the champs you've used)but if I can get GM chest on 2 keys NM, I'll be happy as a start. 

My team will have Gravechill Killer, Frozen Banshee, Vogoth, Skullcrusher and Sandlashed Survivor, hoping they synergise enough together.  We'll see!

That sounds like a promising start! Good champs, and many of them play very nicely together!

Did ok using all champs at 50 and in slightly better than average gear (managed 3.5 million with 1 key), but two days ago I pulled Vizier Ovalis, so a rethink is obviously now required! :D