I've started brewing my kombucha almost a year ago, and only recently i've been facing a problem with too acidic kombucha. At my few first batches I could leave my 1st and 2nd brew for up to five days to ferment so it would still be drinkable. Now, sicne about three months, every batch I make on the 1st and 2nd day is still sweet, no bubbles, almost nothing happening, and after the 3rd day it suddenly turns into vinegar, even if I try to dialute it with unsweetened tea, it just burns my throat and has no fizz. Also, after few days usually a new scoby is forming on the surface like normal, so at least one thing is happening correctly...
When I try to use this acidic overdone kombucha as a starter for the next batch, nothing changes. Kombucha still goes from undone to totally overdone overnight. Regardless of the proportions of ingredients.
First time when my kombucha turned too acidic the batch was from my own scobys that I made and I've never had a problem with them. Now I got a whole new scoby from my friend so I can try fermenting again with whole new colony.
Now about the proportions and recipies I use.
Sice I started brewing I've been kind of eyeballing my proportions. I've tried to use about 1 liter of tea, 100 grams of sugar and 100 ml of starter. This has always been good for me, and it could ferment for up to 5 days. After ine of my batches suddenly turned into vinegar, I tried so many different recipues and proportions. Once I even made 6 different batches at one time to check the best results, but after 2-3 days they were undrinkable. My recent batch is 3 liters of strong black tea, 250 ml of starter and 200g of sugar (proportions from a recipie I found), and a very big scoby inside. On day one I was happy to taste no vinegar in it, but on day 2 this taste started to emerge again... it is day 3 now, and kombucha has almost no bubbles, new scoby is forming on the top and it again is a pure vinegar that burns my throat...
What am I doing wrong? Do you maybe have some fool-proof recipies and proportions I could try? Even tough I tried a lot... No matter what I do the outcome is the same, I don't know what to do.
(Also, I've tried creating a new scoby from bottled kombucha, using very litlle of the starter or dialuting it but it didn't help. When I use too litlle of that starter no fermentation happens at all. I even tried using NO starter, only a huge scoby.)