Hi, Alan!
Can you perhaps share a demo with the problem? I usually use JSFiddle, but anything else is fine too.
In general, currently you cannot affect the repulsive force of the nodes. It's proportional to the node radius, but that's it. However you can affect the strength of the links - in the link style there are the length
and strength
properties. Make the links stronger and see if that helps. Also you can reduce layout.nodeSpacing
, although that will help but a little.
But I'd like to see your problem with my own eyes - perhaps we need to make some adjustments in our code or expose new settings.