Clarification on bond formula, CPMPE calculation, and bond maintenance in SAM

1

Hi everyone,
I’m reviewing how SAM works and noticed that the PSR bond shown in the calculator doesn’t match the old “1 SOL per 10,000 SOL” rule.

Could someone clarify:

  1. What is the current formula for calculating the PSR bond?

  2. How should validators choose their minimum CPMPE — is there a way to see recent winning CPMPE values?

  3. If my delegated stake stays roughly the same (I’m not requesting more), is it enough to fund the bond once, or does it need ongoing top-ups?

Thanks!