At 0.12 bcr-abl you are almost MMR which is a significant milestone. Given your myelosuppression, you should consider lowering your sprycel dose (i.e. to 40 mg). You are very sensitive to sprycel which indicates less dose is likely to achieve an excellent response vs other patients.
I was in your situation. High sprycel dose lowered my blood counts to unacceptable levels. I currently am prescribed 20 mg sprycel* and achieved "undetected" status while at that dose (over 3 years undetected). I had a faster response on the lower dose than the original dose prescribed! I still have mild anemia (RBC count), but improved my hemoglobin by supplementing with heme iron from time to time). Ask your doctor to try a lower dose for one month and monitor response. If you continue to trend downward, consider lowering dose further. Your goal is to find the lowest dose which works. In the case of sprycel, higher dose is not better.
My doctor did not lower my dose gradually. He went form 70 mg to 20 mg straight away and I never had to increase dose after that.
(* I currently take 20 mg every other day preparing to stop entirely to test treatment free remission)