IC2 needs to be harder, you can make a diamond drill in an hour. No reason to keep using the normal mining drill, diamonds arent very rare. Gregtech changes IC2 so its own additional content would fit, not just because it thinks IC2 needs to be "Harder". Its not even that hard to get the resources, thats what quarrys, frame machines, bores etc are for. Gregtech is balanced just fine. I do think that Thermal Expansion recipes shouldnt be as expensive as IC2 recipes, because IC2 machines can be considered as an upgrade when you install the overclockers and whatnot.