Anyone running sepulchur sentinel in ultra cb with counter attack champ 

ive watched couple of vids and seems the magic speed mark for her is around 235, anyone else running a similar setup to be able to confirm this as vids i saw not with counter attack champ 

i have my skullcrusher at 173 speed and the other 3 champs around 180 mark 

i tested her recently in ultra on my 3rd key as it was going to be a easy 3 key top chest anyway and hit 30 mil mark, her speed at moment 42 off where needs to be but was able to block stun 2 turns then cop a stun then block 2 stuns and so on 

trying to see if running my current team with her can get them to or might close to 2 key ultra, my current ultra damage varies due to rng with minimum 28mil to better rng 33mil. 

any advice tips suggestoins greatly appreciated trips player j LOL