I just went to lighter gauge strings and when I intonate my low E it sounds awful. I have to intonate it a bit flat to make everything sound right. On another guitar that I have tuned down to C#, I have the low E(C#) intonated properly but I have to tune the string flat(to about 437) to get it to sound right. I use a 52, which has plenty of tension, and I have tried all the way up to a 60 but still had the same problem. I have no problem having to tune them the way I do because they sound fine, but are these normal problems?