thanks guys for your response so far.
The weather was light x wind, about 5 kts.
I guess with my post I was looking for the magic formula, but as B2N2 said, almost all people struggle with this one initially. I don't know if its normal but I think I tend to be cautious of using aileron so close to the ground - I'm sure I will get over it.
Thinking back to my lesson, I don't understand why I couldn't keep it tracking down that center line.