Jpeter,
You know that rod feels like it can really take the 430 grains no problem. It doesn't feel floppy at all, just nice medium action flexing deep into the butt. I will say I am backing off the rod a ton; I barely hit it at all, it's incredibly nice to put as little effort in it as possible. I've heard the grain window is 350-520 grains and I believe it, as long as you stay mellow with the rod. I do plan on trying a 5/6 for it I'm sure that would be a great line but just the same I wouldn't have any qualms about trying a Skagit with 490 grains like RiverAddict recommends. By the way a 5/6 wc is 365 grains, so the setup I'm using now is only about 65 more grains, or 17% heavier.
I've landed a couple 5-pound trout on the rod already and it handled them with ease. To me it feels like I could take on a 10-12 pound steelhead without any worries at all. Even though the tip is really soft there is enough backbone if you keep a shallow bend in the rod when fighting bigger fish.
Right now I'm fishing an indi with it for trout, golden stones and big midges in deep water (8-14 feet) is the "name of the game" on the Truckee in the winter. The Truckee is real "big water" trout fishing, with a powerful current big boulders and kick-butt wild freestone trout. A 5-lb rainbow is a real adventure and there are trout approaching 30 inches and 10 lbs in there, so you definitely are best served with heavier trout gear. In years past I've fished a 10' 6-wt GLX or 9' 5-wt XP for this job and usually even after a short day of fishing (4 hours or so) my arms and shoulder are toasted, esp. with the 5-wt. With this new rod I don't struggle at all, at the end of the day I feel pretty fresh.
What I really bought the rod for though is swinging soft-hackles in the summer on the Truckee (a bird's nest will catch fish all day) also steelhead on the Trinity in the fall. Swinging soft-hackles for trout is about as close as you can get to steelhead fishing around here where I live. It's so much fun on a floating line and an unweighted fly, the grab feels so much like a steelhead grab it is such a blast. I can't wait for "caddis time" next summer this rod is going to get a workout!