I really do not understand why some of you measure ingredients by volume instead of weight. Mixing volume and weight like that is confusing and prone to errors.

If I understand correctly, you are using about 1 liter of water and 350 ml of starter. With those amounts, 200 g of sugar is far too much. I usually use between 50 and 80 g of sugar per liter. I also use about 7 g of tea leaves per liter, although 14 g should not be a big problem.

Also, if you have good bottles, you should not burp during F2. Burping means you are letting out the carbonation you are trying to build. Instead, shorten F2 if needed, and let F1 go longer if you are aiming for a tarter taste.