[Fyron]

Conversely, use the intel that causes plagues (if there is one - I don't use intel much anyway since it always seems to get blocked ) against larger colonies, since (I think) plagues kill based on a percentage of the population, not a fixed amount (unless the population drops really low, otherwise it would take forever to finish a colony off! )

There is no such project. Plagues kill a nearly constant amount, with just a small amount of variation each turn. I am fairly certain that it is not percentage based.