Hughes500.....
Not meaning ot be disrespectful in any way but simply to highlight a very, very common problem in this industry which you have just demonstrated brilliantly.....the basic mis-understanding of rotor tack and balance....
It has nothing to do do with the MASS of the blades....but the distribution of mass across the blade particularly span wise. i.e. the Span moment arm of ANY individual blade ...that is what blade shops and OEMs set via the adjustment of the tip weights...not the mass.
Do yourself a favour and have a look at
Rotor Blade Balancing - Rotor & Wing Aviation Services - Dynamic rotor track and balance - Australia and educate yourself a little in RTB and its fundamentals which many many people in this industry fail to understand.
Cheers
RG