I don't like the "realistically sized" packs causes the parts/fuel/mass/thrust are not realistically scaled too... So it's result as a mix with "bullshit" and "not bullshit".
The game should be include a generic scaling fonction, in order to set a realistic scale on the physics (thrust, weight, atmosphere params, etc...), but at the same time to set a realistic scale on planets (*and why not on planets packs).
*The way should be to find the formula to switch each parameters of the default bodies from the default values, to realistic values. And then apply the formulas to scale whatever planet packs.