Hi Tony,
With the hitecs I'm able to run my receivers like the diagram I listed. I'm not sure but if you use the matchbox's you may be able to run the same way and free up a lot of channels. You can see how much simpler my setup is as compared to the setup you listed. I'm running this way in my comp arf 40% extra.

If you can use a matchbox to link both aileron servos together you'll free up some channels. One thing I'm carefull about is putting 2 servos that are on 1 surface to 2 different channels using a program mix. On my futaba anyway, there's just a little delay between the servos using a mix that can cause a bind which is exactly what you don't want with the digital servos. For example. If you have a u can do with independant elevator servos and you use a second channel for the extra elevator servo. If you stand behind the plane and watch both elevator half's as they move (move the surface medium to fast speed) you'll notice a lag/slight delay in one elevator half. This will put a bind on the servo...... I mention this as I see you have all of the aileron servos on independant channels and I would also be a little concerned even about the rudder servos. Even though they are on channel 4 there can still be enough difference in receivers to put a bind on the servos. Just my .02 cents

Jon