Equal distribution of particles in ab initio/3D classes

Hi, I’ve been having this problem from the very start. All classes seem to have a similar number of particles in ab initio and heterogeneous refinement. I don’t think the particles are very similar as seen from 2D classes. Is there a way to get a better classification for the particles in ab inito and hetero. refinement? Or is it because my dataset is too heterogeneous and doesn’t have any preference for a given class and thus gets assigned with equal probability?
Would be great to get some insights/tips
Thanks in advance!