Very good points. All of them. I believe MPS is not better than a GraviSuit. Sure, you can fly faster, and you can run faster, and you have regenerative power, but that's about it. So you're spending more resources than a GraviSuit in order to fly/run faster, when using GT recipes. I don't think that's cool, at all. I think they should ofer less, and cost less, and i think the recipe should be consistent whether you use GT, vanilla, IC2, TE, or whatever... Basically, choose one recipe and stick with it. Is MPS meant to be an addon to IC2? To GT? To TE? To Universal Electricity? To vanilla? I really think the mod should focus on being an addon to one of them, and then balance the recipe based on that. Sure, it's the MODPACK'S problem, in part, for not turning off the alternative recipes when GT is installed, or choosing between TE and IC2 recipes when both are installed, and disabling the Vanilla recipes when either of them are.
Under the problem of it not being defined as an addon to any given mod, or vanilla, comes the issue you talked about, of energy balance. Personally, i think it would be ideal if all the major tech mod developers could agree on using a single standard for power that all the mods could work with, but that's in my little dream world and i know it's probably not going to happen. In the meantime, what is MPS being balanced against? That's the main problem right now. I think all of the points you talked about can be tracked back to this single, and most important issue. What is it being balanced against? Is it the IC2 Quantum Suit? Is it GraviSuit? What? When that question has a definitive answer, then the discussion can move forward.