I've added some of the mods you guys suggested and finished unifying the oregen, so balance/recipe tweaking is most of what I have left.
One thing I'm thinking of doing is eliminating things like tesseracts/dimensional transceivers to force more "realistic"/interesting builds, but I'm not sure how far I would extend that if I did it. For example, ender chests - they definitely fit into that category, but they're so damn useful that I'm hesitant to get rid of them. Even tesseracts I'm not sure about, since it would make things like powering moving quarries extremely challenging (not entirely sure how you would even do it short of attaching a power gen system to the quarry.
I've also noticed that several mods have options to enable harder recipes built into the configs, mostly to require steel instead of iron for things (i.e. big reactor parts). I'm thinking that would probably be a good idea since it would provide some early impetus to get steel production going.
Definitely have to playtest it all first though, which is tricky since I'm new to a lot of the stuff I've included. The pack is just for personal use at the moment, but I do like the idea of polishing it as much as possible and releasing it - would be cool to (potentially) watch people try it out and see what kinds of things end up being possible.