Populating a graph and retrieving node positions not working

Start with the supplied construction and position-reading sequence around Microsoft.Msagl.Core.Layout.Node, GeometryGraph, SugiyamaLayoutSettings, and LayeredLayout.Run(). Reproduce the overlapping positions, then determine what correction is required and how curved edges around nodes should be handled. Done means the example yields distinct node positions and addresses the edge-routing question.

I am trying to use the MSAGL library to generate node positions. I have gone through the samples and have not found a simple example that helps.

I have my own custom Graph object with a list of custom edges and custom nodes. I am iterating through them, adding them to the GeometryGraph, creating a layered layout, running the graph, iterating back through the nodes, and retrieving the node positions. The resulting nodes positions are incorrect, they are just about all overlapping. I tried scaling the positions by 100x but they still overlap. What am I doing wrong?
(Here's my code)

1. I create nodes and edges. I make a dictionary for the nodes so I can reuse them in my edges.

Dictionary<string, Microsoft.Msagl.Core.Layout.Node> nMap = new Dictionary<string, Microsoft.Msagl.Core.Layout.Node>();
int radius = 12;
foreach (var myNode in myGraph.nodes)
{
    var curve = CurveFactory.CreateCircle(radius, new Point());

    // var node = new Microsoft.Msagl.Core.Layout.Node(curve, id);
    var node = new Microsoft.Msagl.Core.Layout.Node(curve, myNode.id.ToString());

    graph.Nodes.Add(node);
    nMap.Add(myNode.id.ToString(), mNode);
}

foreach (var activity in myGraph.activities)
{
    var source = nMap[activity.chartInfo.source_id.ToString()];
    var target = nMap[activity.chartInfo.target_id.ToString()];
    graph.GeometryGraph.Edges.Add(new Microsoft.Msagl.Core.Layout.Edge(source, target));
}

2. Then I create my layout settings. I've tried changing properties on the settings to see if they produce different positions

var settings = new SugiyamaLayoutSettings
{
    Transformation = PlaneTransformation.Rotation(Math.PI / 2),
    EdgeRoutingSettings = { EdgeRoutingMode = Microsoft.Msagl.Core.Routing.EdgeRoutingMode.Spline }
};

// Tested these out but they didn't work
settings.MinimalHeight = 700;
settings.MinimalWidth = 1300;
settings.NodeSeparation = 200;

var llayout = new LayeredLayout(graph.GeometryGraph, settings);
llayout.Run();

3. Then I get my custom nodes (from a dictionary lookup) and set the positions from the GeometryGraph nodes:

foreach(var node in graph.GeometryGraph.Nodes)
{
    var myNode = myGraphNodeMap[node.UserData.ToString()];
    myNode .x = (int)node.Center.X * 100;
    myNode .y = (int)node.Center.Y* 100;
}

Can someone point me in the right direction? What am I doing wrong?

As an aside, how would you create edges that curve around a node?