I`m quite confused by what you wrote.
You configured your worldconfig exactly like its supposed to be.
You get a giant ocean.
Your BiomeMap shows exactly what you want.
But, somehow you dont want that?
So, I´m going from there:
First, to answer the thread Title:
To get rid of the Ocean in the Entirety, you shouldd set these:
Second, you can add a size to the “/tc map” command. For example: “/tc map 500” would generate an giant map.
Well, TC can be a bit overwhelming. But if you can somehow explain your problems so people dont need to guess what you actually want, I can probably help you with most stuff.