First and foremost, ignore the scale, take measurements of your gut (yes, with a tape measure), since this is your main concern.
Measure weekly.
The scale is deceiving and sometimes you lose fat, but gain muscle and eat food -- which makes you feel that you're not progressing. With measuring, you KNOW if you're progressing or not.
You seem like you're on a good path. How long did it take to go from 200 to 193?
There's only 3 things you have to do to get down to 12-15% body fat:
1 - Workout 3 times a week with weights.
2 - Eat 1g protein / pound of lean body mass (total weight minus body fat). Chances are that's 150-160g.
3 - Reduce calories.
You seem to have #3 down for now. The homeboy ADD is right about hitting a wall with low calories, but don't worry about that for now. Come back when your weight loss has stalled.
On gym days... Ideally, go to the gym and get a trainer that can help you with proper form in the following exercises:
- Bench press
- Squats
- Dead lifts
- Military Press
- Bent over rows
These are called compound exercises and are proven to significantly add more muscle and burn more fat, because they work larger groups of muscles.
Pick 2 or 3 per day, do them, and GTFO of the gym. You don't need to spend more than 40 minutes in the gym.
Form is key, and make sure you get a trainer or a gym buddy that knows what they're doing. Once you have form down, lift heavy, and keep lifting heavier.
You will get jacked, and you will lose your gut.
Really, that's all you need for now, but if you like to do cardio, throw it in a few times per week, but it is not necessary right now.
On days that you can't workout at the gym... do what the homie Hybrinetics said above and work on push ups/pull ups/sit ups. There's 20 minute circuits to follow on YouTube.
I'm going to get flamed for this, but download "The Challenge" video from P90X3, it's a great starting point, and a great circuit. If you can't do push ups, use your knees. If you can't do a pull up, use a chair.
Do not underestimate bodyweight exercises. I promise, even if you DIDN'T do compound exercises, and just did enough pull ups, sit ups, and push ups, you could get extremely toned.
Don't complicate things.