Looks awesome! I have similar cast iron grates on my kettle, and can let you in on a few tips I have for searing. Since I always have chunks of wood lying around for my WSM, once I pour a chimney full of lump in the kettle I also add about 6-8 chunks of wood. I let this burn for about an extra 20 minutes or so (you might have to lift off one of the grate sections and break up some of the wood embers to get things moving along). This serves 3 purposes: The wood embers add flavor, the flame from the wood will burn off all the residue from the previous cook, and your grates will get nice and hot for searing. Once I have a good sear on both sides I move the steaks to the cooler side of the grill until done.
I also like to add a coat of fresh ground ancho chili powder (along with kosher salt and pepper) to all my steaks. Gives it a nice color and crust, as well as some flavor. Here is a porterhouse I grilled this weekend: