Excessive foreskin. Retract at all.

I had phimosis. I undertook a series of exercise pulling back foreskin back and forth for couple of weeks and also used steroid cream aa suggested by my doctor for 4 weeks. Now my skin can retract back easily when non erect. In erect position the skin goes back half way. If i retract skin at back of glans and then have an erection its quiet painful. I even tried having intercouse in this position. It was painful but i could do it sucesfully. There is a lot of skin which forms a ring at the neck of glans when erect and my foreskin is attached to tip of glans through a lot of skin. My doctor advised not to do anything further and practice having sex with skin going back halfway during erect position. With practice i will be able to retract back even better in erect position. Need to have an opinion do i need to go for surgery or not. I had a very good sex life even when my foreskin didnt retract at all.