@ctsmith - great discussions. You have mentioned your flexibility limitations to your ankles and Achilles, what about your hips, this is often over looked. Tight hips make it difficult to maintain a balanced position on anything never mind standing with one foot in front of the other on a water ski. Visualize the cowboy with wranglers that are too tight,,, ok don't visualize it but you cant move well in tight jeans,, and you can't move athletically with tight hips. Search the web and youtube for hip mobility exercises, i think this will help allow you to stay stacked.