Bench press feet position under the hip ,but where exactly under?

[DorPwnz]

i do a leg drive. if i pull my heels toward my head,i lose balance ofcourse.
so i do it like it should , with heels under hips.
the question is how far should i go? the middle of the hip ,the start of the hip and such.
the more i can bring it back to under the hip the better? means that it will sit under the start of my hip?
Thanks.

[OCG]

Wherever it's comfortable. If you're really flexible, that might be a fair way back.