That's not even close to being what should be set...
Diamonds shouldn't even be generating below Y4 in the OW...
Thought maybe I did something wrong, so tried it again. This time I just looked for all diamonds at all levels and came up with 1075 total diamonds.
For what it's worth, here's how I checked:
- Copy map to temp folder
- Open level.dat with MCEdit
- Get out of Chunk View (TAB toggles - if you start in it)
- Control-A to Select All
- Click the Analyze button (Analyzing 201850880 blocks (Y=0 to 256), or 3080 chunks)
- Sort by name: Diamond Ore (ID 56:0) = 1075
You can also click and drag the top or bottom faces or use the Nudge buttons with Q and Z to move the top or bottom of the selection up and down if you want to see specific Y levels.
Maybe I did something wrong...? But I think this makes sense (other than the amount of ore generated...)