The best ribeyes I've ever done have been over open charcoal. Charcoal doesn't flare up as much in my experience. I get it super hot and close to the grate (I've even used a leaf blower to get it hotter.
) . Then I've put the steaks on for 2 min a side and remove more medium rare and 3 min a side for medium. I usually have my steaks cut 1-1/4" to 1/1/2". Any thicker and this method doesn't work for me. If you like a little crust, I've brushed some melted butter on each side and that seems to achieve that for me. If it flares up a bit, I usually let it go and it doesn't really char it too much given the little time on the grill.
Also, I've found my steaks flare up more when I close the lid on my gas grill. Not sure why.