I'm liking the Z-wolf pack formation. A group or mesh of zombies is fine and dandy, but theres nothing like a wildcard. As the mass group, or center, of zeds act as the main muscle and attention it soaks up just enough attention for the few weavers to move around. IMO, the zombie that gets the most kills, isn't part of the mass everytime. My greatest kill as a zombie was after a large rush, when the humans were reloading and preparing to move to the next position, I had my spot behind the bushes. My targets: a group of players high-5ing with there powerstrike48 open, raider clip out, and maverick cylinder empty. I rushed them, making it 4/5's of the way before someone spotted me and shouted to the group. I got the PS48 and maverick before Mr. raider tagged me. Best feeling ever.
My favorite post as a group of 5 for humans:
Alot like your formation(human strike wedge) mine has a few key differences such as space and select classes. Some things to note: The sides are usually the softest part of a human group due to most everyone's instinctive front/back alerty-ness(i haz bad grammr). Therefore, having most of the firepower in the middle allows greater widespread cover, as well as the advantage of the blowgunner being centered. The blowgunner in back allows for the easiest removal of following stragglers/surprise rushes. With the scouts/sock ninjas mowing down the path ahead, it leaves little to be desired(except more humans?
With only 5people, this is what my squad usually does.