I don't think you really know what you're talking about. Sorry. They're 2 DC behind Drow. 1 DC behind elves, halflings, even with dwarves and 1.5 behind humans.
That is NOT casting like an 11th or 12th level caster. They have the same spell pen, the same caster level, the same spell selection, and are generally 1-2 DC behind a similarly specced caster.
Keep in mind I don't even play a WF caster, but I do play a human. I think CON is arguably just as important a stat as CHA for a sorcerer. My human sorc tends to demolish same level drow sorcs, just because of the squishy aspect. My human sorc is usually 32 hp above drow, and a WF would be 48. And that's assuming the drow maxed con as much as he could, which isn't always the case.
I don't know about your playing styles, and perhaps the way you play, you don't need con. I know plenty of casters that don't... but they're also the same ones that positevly suck when soloing. You bring up an example about trolls. But what about if we change the example from 1 troll to 15 caster trolls.
What do you do then? You can't kill 15 trolls quickly enough to not get hit at all. You can put some crowd control down... but I don't know much crowd control that's going to stop 6 things reliably, let alone 15.
Usually it's just put down a firewall, maybe a solid fog, and then kite them back and forth through it. And the WF is definately more equipped to do that than the drow.
I'm not saying Drow sorcs are gimped.
But your view is skewed.