Have you tried mixing the ink by shaking the pouch trays?

If colors are uneven, remove the pouch trays, and then shake them gently.

If uneven color issues with white ink are not resolved even after shaking the pouch trays to mix the ink, perform "damper cleaning."

If uneven color issues with ink other than white ink (C, M, Y, K, Lc, Lm, Lk, Or, or Gr ink) are not resolved even after shaking the pouch trays to mix the ink, perform super cleaning.