On Ak420auto (see my diary), buds are well formed, trychomes are numerous and getting slightly milky (<10%).
How can i fatten them? Until when should I keep up the feeding to get them ripe for flushing (7days)?
The buds will fatten with time they don't get most of their weight until the last week or two, and you want to keep feeding until the plant is completely ripe then start flushing for 7-days, flushing before the plant is completely ripe will hurt your yield.