Balancing the blades means that all the blades should be at the same weight and center of gravity.
the best way to do this is to purchase at least 6-9 blades weigh them, and assort them in groups of 3 which have almost the same weight.
In your case you have to add small weight to the lighter blades .(24.1g, 24.2g) in the center of gravity until they weigh 24.6g.
Also check that all 3 blades have the same weight.