You do not need to remove the flybar to check blade balance. Check blade balance before you install the blades by assembling the blades together and balancing them on the edge of a glass or the corner of a couple small boxes. see which blade hangs lowest and correct by putting a little scotch tape on the high blade. if you want, I can do a balancing for you and take some pics to post on here so you can see what to do.

As for your damaged fuselage, i recommend replacing it if it is damaged. I have also taped mine a few times, and all that serves to do is make things break off when you land hard or, as in my case, hit things. If you are having a wobble issue, remove the fly bar and make sure it isnt bent. If you have the blue CNC rotor head then all you do is unscrew the little screws, there should be 2, on each side of the rotor head and slip the flybar outta the head.

When it comes to the gain setting on your pots, use those to your own discretion.

Let me know how it goes, PM me if you would like pics of how to balance your blades.

Steve