To the OP bcnorth,
My personal opinion is to avoid grass casting. It is different enough that you don't want to build in that muscle memory. MUCH better to use still water if available. If you can cast on still water, you will find moving water to be even easier. Plus, you will have built the muscle memory of casting on water. Sorry guys, I don't like grass casting at all. I think the visualization described above is significantly more beneficial than grass casting. The couple of times I've tried casting on grass I had to change my stroke so much that I was not really making the same stroke as on water. If you want to see real casting there are almost unlimited videos on YouTube. Personally I watch the SOR prelims and finals frequently, especially the finals. As much as possible only watch great casters, avoid watching the go-pro home video hacks. Don't want to pick up bad habits.
My thoughts, take them for what they're worth.
I see you're a shvingger too!
Bruce and Walker North America - Pro Staff