Sorry Fox, too late. Tried it with a fireteam sized element of trained players (colleagues) with whom I do stuff like that more often.
We randomly placed AI in buildings and attempted to clear them. As we walked in the room (even when stacked) the AI had enough time to react and wound 1 and kill one of our team.
We retried in another building, that time in combat pace.
We all used Rambos techniques. Plus going in guns up + combat pace worked brilliant. We cleared the whole building of 6 ENY AI w/o taking a single shot where we before didn't even get close to the third room.
Stamina proved to be a problem though as soon as a building got more than 4 rooms.
secured stamina breaks where necessary especially for the AR.
Did you cut the cake? You turn at the same speed regardless of whether you are running or not so by all logic taking it slow should mean you live longer.