I just tried it again. Half the rooms in shotgun and shamway will aggro after you kill one or two zeds with a crossbow or silenced sniper. Then you have to either shotgun or mp5 everything (slower run and gun basically) or run and hide which works maybe half the time with de-aggro, then start again. If there are many zeds, you have to do this 3 or 4 times to actually stealth kill everything, which makes the clear maybe 10x longer than run and gun. There are aggro rooms, which will automatically chase you, then you have to run and hide again to stealth kill instead of just throwing a grenade or two. This is with game stage 200. Agi builds are quite garbage. There is serious balance issues. This is with almost all of the books, tons of points, and t5-t6 armor and weapons.
I will time my runs on the next test to compare the two.
One question: You previously said you don't use NV-goggles. Did you increase brightness or how can you still see the zombies in the night?
I tried another shotgun messiah run as well, on insane difficulty with similar gear like last time. I mainly tried to count how many zombies I could kill while sleeping and how often I failed in this. And I just did the ground floor of the shotgun messiah, I don't expect further rooms to be any different. Mainly used the crossbow by the way.
Result: Only twice did I wake up zombies because of failed stealth on the whole ground floor, the other two instances were from failing to spot zombies
Further results: Silenced guns are still much more likely to wake up nearby zombies than the crossbow. And using small stones to distract zombies is a big help in re-stealthing
If anyone wants the details, read on:
---------------------------------------
I killed 2 in the first room but forgot to check the ceiling. Got a surprise later when I ran through unstealthed and got into a fight with 4 more.
Then 2 halls and several rooms with altogether 19 zombies killed in their sleep. One zombie woke up because I didn't see him until I was practically standing on him. One other zombie needed two shots which woke up 2 more.
Then the cafeteria with the zombie-filled toilets in front. Killed 3 in the left toilet, then tried to kill the feral biker. Unlike most of the irradiated before he actually did not get killed in one shot and I needed to switch to vulture. This woke up others so I ran. After getting some distance I stealthed, ran a few meters further and threw small stones into far edges. Killed 4 easily.
The right side toilet still had 3 zombies I killed silently. This was in daytime btw. Then up the ramp, killed another 9 plus 3 vultures. The only one who needed a finisher shot from the desert vuiture was the biker, again.