You should never use truss rod adjustment as a means to control string height. The truss rod is used to set the proper neck relief. Some prefer a relatively flat neck while others prefer a slight amount of relief. String height will vary as a side effect of relief change but as stated should not be used to adjust string height. Once the proper relief is set the next thing to check is the string height at the nut. Too high and guitar becomes difficult to fret. Too low or tight and it will introduce buzzing. The last thing to check/agjust is string height at the 12th fret. You control the string height by raising or lowering the saddle. Many guitar enthusiast learn how to perform their own setups. It is not hard to do if you are handy and grasp the physics behind a guitar setup. Others seek out having a setup done by a trained professional. At this point you should have a respected luthier have a look at your guitar and solve the problem. Good luck.
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