Don't think this is the same case as ifrit ex, my group had push our dps that Levi skip some of the dive phases, pretty much never dive while spawning the 2 adds, follow by the caster then the spumes. The worst thing that I have seen happen when pushing dps is having caster add spawn when Levi still diving, or Levi diving and spawning spumes at the same time, this causes some confusion to some people and they die since they wasn't expecting it.

The only time we died to shield is always when pressing too late.