Gridcoin Whitepaper Diagrams

In an effort to fully understand how #gridcoin decentralized research reward blockchain functions I have made the following diagrams:

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Gridcoin Components of Reward Block.png

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Gridcoin Dynamic Subsidy Calculation.png

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Gridcoin Proof of Boinc Difficulty Algorithm.png

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I have the following questions:

In the Subsidy Calculation, what is the mechanism for deciding between 5 and 150 credits?

In the Proof Of BOINC Difficulty Algorithm, what does the 576 figure represent?

How is the Reward Subsidy applied?

Finally;

I am posting to receive feedback and constructive criticism on the presentation of information depicted in these diagrams.

Edit 1: Corrected diagram # 1.