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.....dd -- did you ever feel the need to add weight to the tennis ball (stones/sand, for eg)?  If so, how did that work?

Using cordage of a weight similar to normal tent guylines and knowing comparative sizes, a pound of lead would probably fit nicely and would provide almost enough heft to prevent too many hang ups.

I had an oh-oh moment last trip, first campsite. My right shoulder had been an issue for months and first toss made it clear that would not be repeated so I learned to toss underhand. Not nearly as accurate but you can really sling it high when needed. More weight is a good thing especially if you use a stick for placement and there's not much momentum to begin the descent.