I use a heavy rock in the bottom of the pot when I pot my Catasetum up each year. They're not particularly top heavy, but they get lots of big wide leaves that act as sails outdoors, toppling the plants when it gets windy.
I'm going to steal that idea! The bulbs on mine grew out at an odd angle, and I felt like I was spending all my time either picking up the pots, or trying to prop them up someway.
__________________ Camille
Completely orchid obsessed and loving every minute of it....