I have had a good look at this xml today, it is full of bugs or inconsistencies:-
- PlanetFrequencyExp is set to 1.0 for None. It is set at 0.7 for Rare, 0.9 for Uncommon and 1 for Occasional, 1.25 for Common and 1.5 for Abundant
- Nebula is set to 0.01 for Rare, 0.07 for Uncommon, 0.05 for Occasional, 0.1 for Common and 0.12 for Abundant
- Asteroids is set to 0.035 for Rare, 0.05 for Uncommon, 0.06 for Occasional, 0.07 for Common and 0.15 for Abundant
- MinablePlanetChance is set to 0.05 for Rare, 0.15 for Uncommon, 0.18 for Occasional, 0.2 for Common and 0.35 for Abundant
- MinableAsteroidChance is set to 0.1 for Rare, 0.15 for Uncommon, 0.22 for Occasional, 0.25 for Common and 0.3 for Abundant
As you can see by the numbers, inconsistent. One even goes down as you increase.