My main guitar I like to use a lot is a Gibson SG Special worn brown. I have had it 4 close to 7 years now, and I love it. Only problem is, if I want to play leads with it I can't do too much bending with out getting a string horribly out of tune. Its not all my strings, its e, b, and g. They'll even be out of tune when I return the next day after being put away tuned.
I change strings just about once a month, and I use Ernie Balls regular slinky: 10-13-17-26-36-46
Any ideas as to why e, b, and g are so prone to going out of tune? Or suggestions as to how to improve them?
Thanks to anyone who can offer advice and insight to my issue.