There is nothing perfect in this conversation. Not a turret, not a app, not a scope, not a rifle, not one thing. Not mils or moa, and for sure not what your velocity is. We take all the tools we have and use them the best we can. There is some theory in the calculation that are made. He used some tools and found the problem. Now he can make the adjustments. To help him make those it would be best to be there and see all of the issues first hand. Suggestions can help sometimes but they need to be tested. To judge eash other suggestions in this imperfect and unseen circumstance is a waste of his time and the readers time.