Lazyass gives pretty solid advice for tilt adjustment and should be followed but also consider your position on the bike. Someone here long ago advised me to look at my position on the bike and said to drop my bars down by either flipping the stem, removing some spacers, or both. It sounds strange but it makes sense because there's a big difference in the amount of pressure on your sit bones when your sitting upright on the saddle compared to when your down in the drops. As you get lower your butt will lift off of the saddle decreasing pressure. Now here's another place where you can go too far so you want to find that perfect balance where you're decreasing pressure off of your butt and not putting too much pressure on your hands. Also verify your saddle height is correct so you get that slightly bent knee at the bottom of a pedal stroke because seat posts will sometimes slide down unknowingly and that will contribute to your pain as well.
Try this, sit down on a chair and pretend you're on the bike sitting upright with your hands on imaginary handlebars. Now roll your body forward lowering your hands at the same time while paying attention to the amount of pressure on your sit bones. As you roll, the pressure decreases. If you should remove spacers to get lower be certain the position will work for you by riding several rides before cutting the steer tube. There's no going back once you cut and if you do lower the bars you'll more than likely have to re-do your height and tilt adjustments again. Hope that helps!
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