The technique I learned for ceiling fans may be useful. Typically, the weights involved there are only a few (10?) grams. Since you're working with something much smaller, you'll need less. Be prepared to spend some time.
Start the fan, and note how much noise it makes. (For a ceiling fan, watch the wobble.)
Apply a small weight to the center of one blade. Start the fan, and note whether it is noisier or quieter (wobbles more or less).
Move the weight to the next blade start it again, and note the noise (wobble) level.
Repeat for each blade. Make a note of which blade(s) had the best effect.
Return the weight to that blade, placing it closer to the hub. Check the noise level. If it's better, move it farther in. If not, move it out. Repeat until (a) you're satisfied or (b) you go crazy.
Ceiling fans come with a balancing kit, one or two self-adhesive weights and a plastic clip with the same mass. You use the clip to find the best blade and location, and then stick a weight there.
"For shame, gentlemen, pack your evidence a little better against another time."
-- John Dryden, "The Vindication of The Duke of Guise" 1684