I am not asking questions, I am making assertions.
The target must be lost from view in this unless you have a camera in the bottom of your fuselage.
I think that you are probably commited to following the practice manoeuvre too literally. It is the principle that matters. If you keep the enemy in constant view you are using lead-pursuit and point-and-shoot tactics. What really matters is knowing where the enemy is. Especially with energy tactics which rely heavily on displacement manoeuvres and lag pursuit. Remember also that your opponent also has to see you and you are behind and above him. Try to think of it as trying to keep your lift-vector (canopy roof) on your opponent as you make a displacement roll.
Here's a good example of a displacement roll (based on the wingover-roll) from Requiem. Theory is one thing but practicality is something else. I'm just making a suggestion; the decision to try it is entirely yours.