Nice so far.
Have you considered the early version of E9-R?
http://www.warbirdinformationexchange.org/phpBB3/viewtopic.php?f=3&t=19452In any case, beware the colors in that profile for E9-S. There is no yellow on the top of the vert stab on any of these planes - it's silver, and any blue will be the same "Insignia Blue" as the national insignia. Also, the rudder trim tab and wingtips look more like black and not blue to me.
Also pertaining to your shade of blue, I think it's too blue. Look at the color picture from your first post in this thread, it's a very dark blue. Here's the shade I use for US insignias: Red-19, Green-30, Blue-42, Hue-211, Saturation-55, Value-16