In my personal experience, my metabolism went up to a male range after maybe...4 or 5 months on T. For some, it could happen even sooner. That means that 1300 calories is WAY too low, and could easily end up making your body want to hold on to weight. Even for a female metabolism, over 200 lbs, 1300 is pushing it. 1200 is the lowest and that's for people with female metabolisms who maybe only have like 10-20 lbs to lose. People with male metabolisms, especially at those initially heavier weights, just can't subsist on that.
A lot of people find that when they hit a plateau, they often break it after, or even during, a week or so of maintenance calories. It seems counterproductive as the standard formula is less calories = more weight loss, but it's often not that simple, especially after sustaining a weight loss effort for a while.