There's plenty of turns left in the truss rods, they are not very tight but also not loose. Sorry if I'm communicating strangely at times, English is not my primary language
I didn't realize, you English is very good actually. That neck will pull back if you tighten the truss rods and if they don't feel very tight as long as you follow the proper procedure you should be able to turn them at least until they feel tight. Maybe it won't get any more straight but it will pull back to be more in line with the plane of the strings of that makes any sense.