Smallmouthaholic,
You may be right.
I flip and pitch my 5, 6, and 7" senkos, on 5/0 wide gap heavy duty offset worm hooks, and I'm luck if I get more than one fish per senko.
I find that, in order to get the same fall rate as the originals, mine seem to be more fragile. They hold up fine until a fish eats then, and then I'm lucky to even get one back with the fish.
I've been using Kosher salt, because the larger granules don't seem to change the color as much, but I'll try some of the Bear's fine salt I have, to see if it makes my senkos more durable.