I think you misunderstand what catdepth means. It is going to display levels beneath levels. It is not a setting to say how many cats to display. It is going to display all in that one level and then go to the next level.
I hope that clarifies the confusion and as my reply above states there is nothing
The only top level setting I noted is in the index options and thus looking at your site which we can not do since you have it blocked to viewing I cant suggest anything else. I am assuming what you have is a couple top level cats and many subcats but you would need to make your site viewable to us
Correct your url proves me right here I dont need to see your site to know your not talking about top level cats. You can not paginate subcats only topcats because thats handled by the index script
You might want to try using the normal category view to see how top levels view when you set the top level setting