Too bad to hear that your 830 is not working out for you.
I have both, and, the SOC has much better backbone than the 830. The SOC has a 2mm bigger knot, is denser, and its loft is only 2mm higher than the 830, so it's not surprising that it has more backbone. The SOC also has a "special" grade of hair. If you're trying to choose between these two brushes, I would definitely recommend the SOC. The handle is fantastic, as well (though the 830 handle is also nice).