Here are the settings I've got going usually (haven't changed them in a while other than the seed):

(under World Settings)

Fractal Function:
Method: Wilbur Fractional Brownian Motion (fBm) (could be the difference)

Primary:
Highest Peak: 30000 ft
Lowest Depth -20000 ft
Circ: 25000 miles (I think these were defaults)
Roughness: 0.45 (I'm wondering if this is the difference here?)
Percent Sea: 43
Land: 1.77
(these last 3 would be adjusted to taste)

Editing:
Custom: the maximum number that works under custom (can't remember it off-hand)

I followed on of the tutorials for the Abebe project that was written up for getting more realistic worlds out of FT Pro (it's on their website, I think), which was some processing after (erosion, and a few other things) prior to running rivers.

I hope this helps...I believe the Abebe file, which was in v2 of FTPro died when loaded in v3, but that may have been a temporary issue.

You may need to also adjust the settings under the intensity tab in the colour window.