Hello - I had quite a lot of the same problems here - somehow I was actually able to fix the RT trace, I think I only knicked it, not severed it completely.
Now - I have a controller that is working 100%, all buttons and triggers work with or without turbo just as they should. It only took me three attempts and two trashed controllers, but now I have a ton of spare controller parts
My question is this - When doing the install -I see where there is a connection called "K" in the pictures, being the top of the three points on the RT - but on my PCB (ver. 2)there is nowhere for this to be soldered. On the PCB I see RTO, RTI and GND in that center location. There is no "K" and there is no additional solder point for K.
Question 1: What is K?
Question 2: When using turbo on any button, I get a stuttering effect. In essence, the audio output of any "turboed" function sounds like morse code ... .. ....... ... ..... ..... etc. From youtube videos, i was expecting a more uniform output ................. etc.
This is across the board, from my xbox dashboard to any game i'm playing.
Is this caused by not having a solder point to "K"? or is there something else happening?