Correct foot stance to ollie goofy?

What is the correct foot stance on the board when you ollie goofy? What I've been doing is putting my front foot on the board diagonally (toes toward the nose) and the ball of my back foot on the very edge of the tail, with my heel pointing outwards. Also, I do NOT have a straight back, I slouch. SO I naturally jump off the board when ollying. Any way to fix this too?