IIRC, the pH is correct at 10.1, but the bromide seems too high, but I may be wrong. I have forgotten too much!

All salts in the Kodak formula are Sodium salts and no potassium salts are used except for KI (KJ in German). So it is Sodium Carbonate and Sodium Bromide, etc..... Calgon is no longer used. Kodak uses Quadrofos or Dequest.

I think the carbonate is low in your formula. That would cause low contrast.