Sounds like Head is doing some changes similar to Dynastar. The Carlos being kinda' like the Sixth Sense Huge.
Like Dynastar, head has been producing heavy stiff charger type powder skis, evolving out of their race ski construction, the Legend Pro Rider for Dynastar, the Jimi for Head.
Now, the SSH is not only wider than the LPR, but softer flexing and flat in camber, partially cap construction, lots of fun and way easy in powder. I'm guessing the Carlos is softer, more floaty and slarvy than the Jimi, like the SSH. Go for the fatter more modern more fun ski! no question.
(I doubt Head would make any ski that's too soft, just as SSH is still the stiffest ski at the wide end of the shop wall, at least until the Carlos.)
Those little trips across groomer to get to the real stuff are nothing, not a factor in your choice, drop it out of the equation. You do change out the fatter (125) ski for your crud buster sooner and more often, however.