Uneven breasts after lift and implants

I had breast implants done because my breasts one was bigger then the other . I wanted 300 on the left it was bigger and 350 on the right . She put in 300 on left and 450 on right . Now the right was bigger then the left. I went in ffor a revision and lift she put in 620 both sides. Now i have the left slightly biggeer and higer then the right. She said the left will drop more to wait a year . I woulld like to know if thats true . I dont want to have another surgery to correct it i spent 17000