I am going to preface this by saying this is all based on personal experience and not on any published research papers.
Counting calories is a complete waste of time and energy. The published # of calories for each food has such a wide tolerance zone you don't know from day day day how many you actually consume. Even if you did know, your body will metabolize those calories different every day. What you think might be a 3000 calorie day could actually be anywhere between 2400 and 3600
If you are a weight trainer, the two main feedback devices are your weight and your strength. If you are cutting you should weigh yourself every day to monitor that you are losing at an expected rate. The loss will not be linear, but should show a down trend. Factors like carbohydrate consumption and DOMs will cause you to retain more water therefore increasing body weight.
Use your 2750 calorie diet as a baseline and if:
- Weight goes down, strength stays the same or increases - maintain current meals and portions
- Weight goes down, strength decreases - Add a meal or increase portion size
Also monitor your desire to train. If you normally look forward to training or feel a lack of intensity that may also be an indicator of lack of food
Also look into adding a cheat meal or cheat day each week to reboost your metabolism. There is plenty of info about this on this site.