Hard Gregtech

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impossible when you change the config it is global and affects all of your SP worlds ( but not multiplayer )
 
Use multimc to import the ultimate pack into an instance. Customize the instance in multimc. You can create an instance for each world and customize the config for each.

I like to do a creative instance and a survival instance, so I can lock the game difficulty and NEI modes for each instance. Probably some way to update the mods in multimc, but i usually just copy+paste from the FTB folders or from the mod's download site directly.