I feel so stupic posting this but I have a bad problem. I though today 'I will try some heavier strings'. So I got them massive GHS Zakk Wylde 10-60 gauge. They are on my guitar and the E B and G are tuned fine, but I can't tune the heavy wound ones. I says on the tuner that they are tuned, but they sound really bad, completely out of tune. What is happening?