I never eat the things..eeeuuggh.
But-when I do them at work,I have the water at a good simmer,I break the egg into a cup-then tip it into the swirling water. As soon as it looks to boil,I turn the water down to a simmer. I find how well the eggs turn out is also dependent on the freshness of the eggs. Sometimes they just won't co-operate.... ;-))
And sometimes a bit of a swirl does help.