I will go:
Viv, Elk, kramp, Tyr, Skadi
But it all depends if your alliance runs a same tank strategy.
I have swapped them back,yes…but what is the point of change Tyr and Elka?
Your opponent would most likely stack green heroes, and green does weak damage against red, so putting the red hero in between the blues Tyr will not take that much damage, as you can assume the opponent is going to target your right side with the blue heroes. I hope it makes sense.