According to America's Test Kitchen, do this: Pat dry. Start cold in nonstick/cast iron — no preheat, no oil. Flip every 2 mins. Start high, after few flips, turn heat down to medium. Keep flipping every 2 mins until done.
Most cuts worth eating have some fat on them (filet mignons might not but they are very dry anyway -- to me they're not worth it). This fat is enough to brown and cook the steak on. It's completely unnecessary to add oil.
I find the pan-sear delivers almost the same results in much less time (of course, you won't get the uniform insides of a reverse sear, but close enough since you're flipping so much). I'm also at a stage of life when I can afford better cuts of meat.
But I think ATK or someone else debunked this as the best practice. Flipping more than once gets you more even internal cooking.
In my oven, 230deg is just about maximum temperature; cooking anything that hot for 30 minutes will result in cinders. I take it your oven is calibrated in Fahrenheit?