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That's not how the mod worked. You've always grown the inferium tier and crafted them together to make higher tiers. The higher tier seeds give you a larger yield per harvest.
The mod was updated to remove this file from the Config folder into its proper place in the world save folder. It can't copy the information over if you don't have the file left in your configs in the first place.
No one has veinminer since it's not in the pack, the modpack comes with OreExcavation which is how you "veinmine" blocks.
The infested leaves issue has been resolved and will be included in tomorrow's update.