You add more sugar after bottling? I've never heard of that before. I only add sugar at the very beginning when I'm fermenting the SCOBY with the first fermentation. I add 1 cup of sugar to 8 tea bags and 4 (1 quart) cups of water. Then, I transfer it to a gallon jar where I add 10 more cups of...
The soda bottle technique is pouring it into bottles (like you're doing already) and then letting it sit for 1-5 days for a second fermentation. As it continues to ferment, you need to "burp" the bottles, which means that you open the swing-top bottle and close it again. This lets some of the...
Have you tried bottling your brew in soda bottles? After brewing in a large jar for 3 weeks, I transfer them into bottles and leave them in a dark room for 1-5 days where I "burp" them at least once a day. Some of my batches carbonate more than others, but this trick has worked for me without...