When I'm ready to publish the numbers from the lab, I will, but in the mean time, I suggest removing the top cap from a mountain bike or a fat bike with a carbon steerer, and riding it for a few days over rough terrain and medium sized drops. Make sure the stem bolts aren't over torqued. You may be surprised to find that your headset has loosed. The stem cap is actually producing pretty significant downforce if the bolt holding it is torqued, as most specify, to around 4 Nm.