theese are the coordinates of my farm: -1409.767 / 11.57124 / 360.156
the farm is three chunks big, its on level 11, the caves are lit up (see the pictures) but, is it enough? can i left the torches on the ground or not? what am i doing wrong? or are the coordinates wrong?
I've not checked your coords, but assuming you got them right, it looks fine; are you standing more than 24 blocks away but less than 128 blocks?
If you're standing right next to it, they cannot spawn.
If you just have the 1 area and have not lit up EVERYWHERE within 128, then spawning rates will be very low; you might get 1 in an hour. Which may be OK if you just want a few balls. You'll get a lot better results with lots of lighting up of surrounding caves, and if you make a few more platforms.
I only have 2 platforms, in a quite well-lit-up area, and get a few stacks per real day; I use an iron golem standing on a post in the middle, and a cactus with hoppers around it; they hop toward the IG and die on the cactus.
Mine is spammed with torches, so I'm pretty sure they don't affect anything.