Kelly,

Great question.
You are absolutely correct in your thinking. 140 ATV / 100% DR's for precision.

My throws are basically this. (Carden 40% 260)
Aileron: 23.5 degrees up and down
Elevator: 12 up and 13.5 down.
Rudder: 30 low (Snaps) 45 high (Hammerheads and rollers)

If you have set up a rudder to elev and aileron mix, your probably are using up elevator for each side of rudder throw.
Once you have that set, leave those mixes on all the time. Its not a Knife Edge mix like people call it. Its a Rudder mix. Meaning, you need it anytime you use the rudder.
The reason you need more down elev throw than up is becuase when you do a negative snap, your getting up elevator (From the mix) and you need down. The extra degree and half makes up the difference for the mix.

I fly JR and use flight modes. Heres how I have them set up because I dont like flipping switches either.
With this set up, I only have to flip into FM-3 once or twice during a sequence.

FM-0
IMAC rates and low idle for landing

FM-1
IMAC rates and high idle for flying. (ever lose the motor in a spin during a contest??)
I also have a throttle to elev mix in this mode.
A touch of down elevator with idle for straight downlines.

FM-2
3D throws and low idle. (I like flipping to high rates on landing rollout but dont want the idle coming back up)

FM-3
IMAC rates with a higher rudder throw for Hammerheads and Rollers

FM-4
Not used but, same as FM-3 in case the switch gets into that position by mistake.


Hope that helps.