Texas Divorce - Wife earning more but having full custody

I am finally ready to file for divorce to my husband of 7years. We both work 2 jobs but I make more. The main reason I want to divorce is because I have been the main financial support for 8years as well as being the default parent to 4kids - he is not able to hold a steady job but started 2 jobs last April. His extra money goes to his home country and I have been spending 70% of all household spendings. He has 0 savings. When he is out of work, I cover all as a normal spouse should... I am tired and burnt out. I asked him for support... telling him I would be dropping one job, needing him to get us on his work insurance... he was against. I do want to drop to 1job and rest. I am burnt out!

Long story short, I am here ready to file, I asked for amicable, he is okay with me keeping all the kids and when I asked for normal Child Support based on his income, he says he does not agree

Additional details. I am in **Texas**. The thing we don't agree on is the Child Support. We agree on all other terms. (1) I will have full custody (2) we can sell the house (I will buy him out) (3) He will leave the house by end of month.

**The only disagreement is Child Support** \- the official calculator is saying $2300 (based on full custody). But he knows I earn more than him and he refuses that amount, he says $1500.

What should I do? I would like to avoid going lawyers if possible.

Edit to add: I truly appreciate all the inputs. So helpful. Although I do have a great case, I will go the lawyer route. The OAG of Texas is clear he needs to pay $2300.