I was hoping to see where the end of you boom was at your handlebar connection. Ideally a short video of you from the side pedaling circles (without your chain on) is the best. To me your knees could be lower. I would try a shorter chainstay to drop your knees, got 145 cranks so you feet don't go as low or as high. You also might then benefit from a curved slider because a shorter chainstay will till your handlebars up a bit. If you have the time and money to experiment with what I have mentioned above I think you could drastically reduce your aerodynamic drag.