Main Rotor Blade Chordwise CG?

[Rigga]

MLH,
Then you need to feed weight into the Front "D" of your Blade. This is likely to be hollow and placing the weight at the Tip should do the trick (for a low-use experimental Blade)

Failing that - it may be possible to add profiled weights to Leading Edges.

Another trick might be to remove all the paint aft of the Spar? (but not the annodising or laquering)

Good luck with your project.
Rigga

Edited bit: This was written as you wrote your reply - Sorry for the duplication of ideas

Steel might hold up better but is liklely to be more resistant to flexing.