Thank you for the question. I totally agree big implants can mean big problems. Having not seen your photos of how large your breasts are it is difficult to comment. There will come a time where u want to down size and that can take multiple procedures including breast lift more scars. There would be some difference however not that much in my opinion. I would strongly recommend for you to discuss this with your board certified plastic surgeon. I hope this helps.
A difference of 10-12% is not likely to make a great difference. Consult a PS in your area.Ron Hazani MD