Look, its your choice.
Feeding twice per week is 100% alright. Its NOT overfeeding and its not powerfeeding. If you want to fed twice per week, fine. The only time it really becomes a concern is when the snake is over a year or so old and its metabolisim slows. Before then though twice a week is far below what could be considered too much.
If you do want to decide to fed twice per week, one prey item is fine. If you want to fed once per week, two is fine.
bmm