Special Operations Event Discussion

I really like the concept for these events, but every Tier 4 (except the first event) was near impossible. It said 80+, which I am and I ran Palpatine lead, Vader, RG, and combinations of Magmatrooper, Shoretrooper, and Sidious, but once I kill the Death Troopers and the Shoretrooper on event 4, Krennic gets a huge speed boost for some reason and starts dealing insane damage. And where was the forced ally? We could have at least had someone like Jyn as an ally.