Not yet. I'm experimenting. I always made my Club-Os with MF Soft Sinking 4:1 salt ratio. Sink rate was perfect, and only very slightly stiffer than Senkos(tm). My goal was the easiest possible formula work to fish ratio. I've got big fish checks, place and win money, and a few hundred+ fish days with them, so I figured it was good enough. Now it seems to be gone except for a gallon or two in my big jug, and I am looking for a new easy formula.
When I make Club-Os I make a lot, so I don't run out to quickly.
I did order some softner, but I hope to find a mix that is "good enough" without it like my old mix is.