The key to nice tender ribs is low and slow. Another method would be to leave in your oven warmer overnight (at about 150 degrees), and finish on the grill. Also, my neighbor will preheat his oven to 350 degrees, put the ribs in, turn off the stove, and go to bed. And lastly, if you have to, (I can't believe I'm saying this!) you could parboil them for about 30-45 minutes with vinegar and salt in the water, then finish on the grill. No matter what, you have to break down the connective tissue to get tender ribs. Give it a try, and let us know what you think.