mission impact on rank

I tried to find information regarding how missions affect rank. The sites I found implied some kind of RNG, and said that bigger donations affected rank more. I'm starting to question all of this. Here are my results from earlier today;

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125,000 CR donation – 1% rank increase

200,000 CR donation – 1% rank increase

200,000 CR donation – 1% rank increase

750,000 CR donation – 1% rank increase

1,000,000 CR donation – 1% rank increase

1,000,000 CR donation – 1% rank increase

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cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

cargo mission (2 pips rep reward) – 2% increase

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combat mission (4 pips rep reward) – 3% increase

combat mission (5 pips rep reward) – 3% increase

combat mission (5 pips rep reward) – 3% increase

combat mission (1 pip rep reward) – 1% increase

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This hardly seems RNG, nor do bigger donations seem to make any difference. Am I just finding old info on the net?