As a matter of interest, what are your symptoms and what is your quality of life like?
The small and curly RCA may have developed another blood supply to the area deficit of blood supply from a normal RCA....may requrie a bypass if a serious perfusion problem.
The LCX bifurgates with the LAD from the main artery. Often this location cannot be stented, but I am not aware that there cannot be bypassed!. Nor have I ever read the two arteries (RCA and LCX) bypassed together presents a very high risk.
You have a strong heart as evidenced by 70% EF. Six years ago, I had an EF19 to 29% and that caused heart failure and today my heart is pumping normally. I had/have totally blocked LAD (collateral vessels developed to provide a natural bypass.) The RCA was 98% blocked and stented. My LCX is/was 72% blocked...no stent. Medication, exercise and diet improved my health.
The Cleveland Clinic accepts medical records (fax, etc.) and provides a diagnoses. Also, the Mayo Clinic in Minnesota is well recognized health center as well. Both have up-to- date technology and skill, acknowledge, and experienced heart surgeon.
Hope this helps. Take care.