I have a bass that the trussrod is at max. it plays great just want it a little lower. the saddles are lowest as well. The bass has flats on it but sat for 30 years with them on. will rounds help ? I only nedd a little. The truss rod was all the way open whne I got it so i was able to take the bow out a lot by tightening it up. but it could use a quarter more turn but i dont want to break anything.