Maul Event Unplayable Bug—finally passed

After about 30 tries, I made it through with the speed set.  I could complete the first stage of the Spider Maul Event because Tartful Wookie dies immediately.

I fulfill all the requirements, but the mission unit Tartful Wookiee Lead cannot be upgraded and he is the weak link. 

It is a mission unit at relic 6 without mods. It should be adjusted for relic delta changes or for the one in each players roster. 

I tried with Yoda and Chewie Speed set and Potency max at 350 speed. 

I also tried offense and Health set max at 331 speed. After 20 tries I am still trying to pass this level.