Everyone's runs vary, I'm convinced of that. Be it putters, mids, or whatever, there are differences.
I agree that the SS versions were not as soft as i thought they would be, so I have SSS's for true putting. I expected these to be much like R-Pro or the gummy Star Rhyno's but they aren't. And for me, that is good, I like the SS and SSS flexes.
Well, actually, I have had some that were really, really soft but I have since traded or plan to trade them away.
I have 4 SSS Magics (red) that have equal flex and I like them. They also have a textured finish to them. I have 4 SSS Voodoos (red) that have equal flex as well, similar to the Magics, but the flight plates are a touch thinner and the finish is smooth, though they are tacky. They are nice, but a bit different feel than my Magics.
I also have 4 SS Magics (lt blue) that are stiffer, but have the textured finish, and 4 S Magics (white) that are stiffer still, and much smoother, still haveing good grip. Been hoarding up Voodoo first runs. Can't really tell the difference between them, but they are firm with decent grip, and I like them for approaches.
So I have a ton of putters, but I do like them, for different situations. Some may go...
My recommendation is find one you like and get several others in the same weight, color, and so on as there is a good chance they were run at the same time. I've been buying in bunches from the same store, in the same color and weight and have had the best success with consistency. Might not be they way you want to do it, but it increases the odds of a consistent set.