My breasts are red post breast augmentation - how to fix this?

I don't think anyone can tell you exactly what is going on, but your plastic surgeon can rule out infection, which can cause redness. You can make sure you don't have a seroma by a breast ultrasound. Thin, stretched skin will show increased redness if the blood flow is increased, which it might be secondary to the large stretch forces on the skin from the large implants. There might be an element of venous congestion from the large implants pressing against thin, tight skin.
If this is non-infectious, which it probably is, the most constructive option would be to remove these large implants, see if everything settles down to normal, and then proceed with a breast lift and smaller implants. Might also be a good idea to stage the lift and re-augmentation to avoid nipple areola vascular compromise in this case.

I'm sorry you are having issues since your breast augmentation. Based on the photos you will have better results if you have the implants placed beneath the muscle and have a lift to correct nipple position. Discuss implant size and style as well to ensure the best implant to fit your goals.