There are many ways to multiply EMC. You'd have to remove all of them. Blaze rod macerators, flax capacitors, darkrooms, cobble gens, Soup generators, Auto-milkers, Slab triplers, &c. Better to use something without EMC value as currency on your server. Any server with EE installed will have massive inflation.
Try removing the crafting permissions for IC2 credits, and spawning them in for players to use as physical currency. Since they don't have EMC value, they can't be duplicated, and will thus be a better economic basis.