Units should got extra Recieved Accuracy for each near Friendly Squad (An aura maybe)
We could tweak this with the amount of increased RA and the range of the effect.
That way bigger blobs will exponentially decrease their effective hit points.
This ideal has been mentioned before bit didnt gain much attention. I Think it can be a good mechanic bu at this stage will be too much of a work.
Personally i think a bunch of pp moving around together in open field being easier to hit is very logic.