In my opinion, reading though each of the reply's here, i see a lot of things that are valid was/ suggestions that would go in a good step to improving efficiency, from limiting ships, to entering and exiting sites, to eliminating the tagged targets quickly. What i find personally to be the best way to have a fleet being efficient, is having the max numbers we need for fleet. More people is more damage, obviously, and that raises the point that you cant always have people online all the time because "real life" is a thing, but what if our pool of people was larger then their is a better chance of having more people in fleet at most times of the day. So my suggestion to gain more efficiency in fleet is actually a suggestion for more propaganda so spread WTM's renown to more people in the eve community looking to run incursions. For example; I'm a new player looking to get into incursions because my friend said they are pretty good for starting out, but i don't really know eve's mechanics that well so i don't know how to find incursion groups. I'm sitting in station, spinning my ship; as most of us do, and im watching the ads in station, and i see ads for all kinds of things, including the incursions i'm looking to do, then i immediately go to whoever i saw to get started. +1 person in that pool. if we can be the first group they hear about were sure to get more numbers, and more efficiency, more isk for everyone. The more the new people run the more they will upgrade their ships, and they'll stick around could the WTM community is best community.
Now i don't know if this has been a thing gone for in the past, if it has then maybe its time to try again, if not, i don't see how it could hurt. otherwise keep shooting out ideas for better efficiency, and we can keep moving down the road of progress!