Spektrum DX-6 into a Blade CP...
The DX-7 transmitter is a better choice than the DX-6.. it permits enhanced EXP, to overcome the sluggish response of the Blade. More control response around neutral.
The DX-6 only lets you go softer with EXP.
And I've been playing with a flat pitch curve. Pitch is constant at 65% for the full throttle travel. Makes it just a bit less squirrely.
Easy to do with the DX-7, since you can see the pitch curve.