You probably already know this, but you'll need more than just D3 players for that mission. I have found them nearly useless in the water/shock room with their limited range. When I run it, I generally run 3 or more sets. Final Measure and/or Reclaimer for water/shock room, D3 for last room and protect the hostages and protecting the person carrying the case and sometimes Hunters Faith, sometimes Striker depending on the group make up.
I've never found a group that wanted to try to run this or CS flawlessly (i.e. repeatedly until you get it). I've gotten the other 2 incursions flawless (Dragon's Nest and Falcon Lost).
I am pretty good at 3, but for whatever reason, when I had a group that we gamed a lot together with for a long time (well over a year), they hated CS so didn't run it a lot.
3 of my 4 characters on my 2nd account and all of them on my primary account have all 14 classy sets, all fully optimized.
I generally only do daily combat and crafting during the week, but play more on weekends. During Global Events (if they return) I am on every minute I can be. I love those things. :-)