Can’t speak to the sim, but i found the Tomcat performed best in a 1 circle fight (or, I flew the 14 best in a 1 circle fight), so I pushed it there. The key is to think of it as down range travel, and the first to get there loses.
So, when transitioning to 1-circle, get your nose away from down range, and remember altitude is your friend. It takes time to develop recognition, but you have to develop an awareness for when to perform and energy depleting pull, and when to perform an energy efficient pull. When in doubt, put your lift vector on them and pull. Collapse the distance, unless you find yourself defensive and are trying to create angles to bug. Learn to fly and control the aircraft at it minimum controllable speed without tipping over the edge. It’s better to be a few knits fast and to keep turning, than it is to get too slow and have to dump the nose to get knots back.
Try it out, and post specific questions. Mostly just practice.