Hey dudes, I got a new guitar a few couple weeks ago and I've been having some serious tuning stability issues. It's an Ibanez FR6UCS, so it has Gotoh locking tuners, a GraphTech TUSQ Nut, and Tight End hard tail bridge. All that seems like a recipe for stable tuning to me, but the plain strings consistently will go really flat with bends or even a particularly saucy vibrato. This was a problem with the factory set up, but now that I put a manly set of 12-60 strings on in C standard, it's so much worse. It's basically on the verge of being unplayable, honestly. I've never really had a guitar that had tuning stability this bad, so I'm not really sure what could be causing it. I gave all the strings a good stretch and let them settle in for about a week now and still can't get away with any bends at all. This is also the first guitar I've had with locking tuners, and they seem pretty idiot proof, but it's possible there could be some user error on my end if that's not the case. I'm stumped, you guys got any suggestions?