F-W1
We discovered that all the blades weigh a different amount and that the 3 big blade shops master blade all all different weights
What we do now is as follows
We puchased a very accurate set of scales where we can measure not only the whole blade but the tip weights as well. We then spraypaint the blades to equalise tip weights as well as total weight. We couldnt believe the difference in ease of balancing the machine. Only problem it does show up is the dampers, which unless they are all of the same age produce a problem. This problem doesnt manifest itself in the hover normally in forward flight when you start to pull a turn, you will then find out which damper is misbehaving. However at this stage the ac is very very smooth.
If you have a mismatch of blades eg blades with different erosion strips on them you will never get it just right !
Best of luck, let us know how uou get on.
By the way what track and balance kit are you using ?