I got my intonation done for 10-52 in drop c a while back. I have had perfect intonation up until recently, but for some reason the top 3 string have gone completely out. I thought it was just the old strings but I changed them and there was no improvement. I have known the basics of intonation for a while but hate doing it cause I always feel like Im going to screw it up. So I tried intonating it, and i have done like two whole turns of the screw but there is only a slight improvement. Ive moved it so much im nervous to move it anymore. Am I doing something wrong? Should I have done a truss rod adjustment instead?