Wally13,
I think Helinox is rated for over 300 lbs. I really DO like that it is so light to carry. Nevertheless, with the Helinox & the Alite I'm mostly concerned about durability where those moving parts come into play. Most of the time I'm squirming like a toad (didn't Jim Morrison sing that line?) in my chair and lean on it at all angles to get comfortable due to my back issues.
They sell "footies" that you can put on such chairs to keep them from sinking into the ground. Your idea with the golf whiffle balls ought to do the trick at 10% of the cost.
Partly I need to decide if I am going to be doing mostly "base-camp trips" from now on OR if I will be up for more adventurous trips as in the good old days. If the former, what the heck do I care about weight!? If the latter, I REALLY care about weight! May have to wait a few more months to see how my rehab progresses to make that call.
Still, if I could find a super-solid chair in the 5-6 pound range, I'd probably jump on it (figuratively speaking, not literally... until I got to know my chair better).
215, eh? Hmmm... well, I guess some of us ARE known for telling whoppers here on QJ!

Later,
Jimbo