The fragile balance is not in question.
The only reason i made such a suggestion is that, in general, i feel the Minor are slightly annoying (or maybe, it's just that i don't have the mindset nor the gameplay experience yet to figure these things!).
Sure, the xml defs can be altered. Sure, no colony ships won't ever allow these to expand and fight ME and MAJORS beyond their bottleneck.
It simply is a matter of perception, i guess.
The Universe is small, even to Minor races. Stealing/dealing some techs from those is fun though! Show us a small fleet and a few biting mosquito-scouts at least. (See, what i'm getting to with this - a stepping stone set of variables for the Minors in numerous diverse areas including expansion). Not that the Dark-Ages must be their exclusive weight to carry in the clouds rather than space.

Note (
again) that i'm still aware of most Balancing factors.
Gimme some more room to react at surprisingly weird Modulated-Races, average and struggling to become a real threat to **some** Majors (not all) only instead of just sitting idle like a duck to shoot at.
Go figures.
- Zyxpsilon.