Complex WKT values fail to render

I am attempting to use the openlayers module as a field formatter for Geo's geo_data fields.

Geo Data is a module that is bundled with Geo, which allows you to import shape files and then create a CCK field that presents users with a selection of its values. For example, you can import a "states" shape file and then allow users to select their state from a dropdown.

When the resulting node is loaded, the field is populated with the WKB of the associated shape. On a node "view" operation, the WKB value is converted to the required format, in this case WKT.

Now, because I'm working with existing data, there's a possibility that the resulting WKT is very large. This should ultimately be corrected by a simplification routine on Geo's end.

However, I also hope that openlayers can deal with the occasional large bundle. In this case I can successfully choose - and render - simple shapes such as "Colorado", "District of Columbia", etc. When I select a non-square state, the openlayers map is positioned at 0,0 and contains no data.

Questions:
1. Are there formats other than WKT that would be more appropriate? geojson? Something else?
2. Is there a known limitation of size of import, and, if so, how can we account for this?

Thanks!