I would try to set it up properly first and the only real way of doing that is to dial it in with a scanner. Once it is set in the correct position then cable tie the loom and double check the voltage readings then road test. Almost guarantee it is the loom and connector making it go limp home...did it on my x-trail until I sussed it out.
Also, one other thing I forgot about, sometimes the sensor can become contaminated with debris (moisture, carbon, etc) I took mine apart and cleaned it carefully before reassembing....but yours may not need that doing.
If you do try to adjust it manually then be aware it is the minutest movement required to make a huge difference.