Hey Thomas,
As I explain in this blog post:
compojoom.com/blog/entry/changes-coming-up-with-hotspots-4
the infowindow will go away with the next hotspots release.
Currently you'll have to hack several fies if you want to have it bigger:
media\com_hotspots\js\modules\hotspot.js
media\com_hotspots\js\modules\tiles.js
media\com_hotspots\js\modules\hotspot\hotspot.js
Look for the line:
this.infoWindow.setOptions({disableAutoPan: true, minWidth: 200, minHeight: 30, maxHeight: 350});
And change it to what you want to have.
Cheers,
Daniel
