It might help you to read the bottom of page 67 and the top of page 68 of Level 3 of the course again for clarification. Marie states that the numbers are used for 3 different purposes and thankfully the personal energy number does not correspond to the flying star (my PEN is 2, flying star 2 is the illness star).
My front door also faces north, which is my total loss direction. It is located in the NW of the house. I would make sure I sleep in a good direction, activate my best directions, do all my space feng shui activations and time feng shui cures/activations including the monthly ones in order to minimise the impact of the bad front door.
At least the door is out of the way of the Grand Duke Jupiter this year.
Best regards
Lillian