It took about 3-4 months for mine to start to settle out, but they were never a pair to follow and symmetry guidelines. I ended up only feeding from one side in the end because the smaller one was a poor performer and it caused too much anxiety for me & baby.

Just give it time, and accept that any asymmetry from before will probably be exaggerated a bit from now on, but hopefully they sort themselves out to a reasonable level. In the mean time, the chicken fillet idea is great!