I would go with longer flybars. I am no expert on these things but from the research I have done on the forums, longer is better.
The extra length will not only make it more responsive but also make it more stable. I am planning on replacing my blade cp flybar with a larger one from a t-rex soon, if I can find one about the right size.
If you want to make it a little less responsive try wrapping a little solder wire around the flybar where the paddles are connected, that would probably be easier than finding weighted paddles. This helped me a lot when I was learning to fly this bird.