S 7 string bridge problems
He wrote earlier when I was busy, I told him to let it sit for a day, springs do not like to have many changes to them made at one time. The second part of your problem is probably how it was retuned, and I'll type this verbatem from the Ibanez "How to tune your floating tremolo system"
1. Tune your guitar. However, there is a trick to it at this stage. With both non-tremolo and 'vintage' tremolo guitars you can bring each string to pitch independently of the other strings. This is not so with a floating tremolo! Though each saddle is separate from the others, they are all mounted together on a single, large plate. In order to get your strings evenly in tune, you will need to tune in "stages". What we mean by this is this: start with the low E string. Turn the tuner until the string is no longer slack, and then move on to the A string. Do this with all the strings. Remember, you're not trying to achieve any type of tuning yet - you're just pulling up all the slack. After this is done, begin with the low E again, and turn the tuner about half a turn, then move to the A string. Do this to all the strings. Then repeat it. Check yourself with a tuner. Eventually, you will get close to being in tune. When everything is close, go ahead and finesse your tuners so they are in tune. *Why is this lengthy process necessary,* you might ask, *and why can't I just tune normally?* Good question! The answer is that attempting to tune "normally" will result in a tremolo unit that has pulled up from the body to such an extent that the action is now about half an inch high, and totally unplayable. Doing it this way will keep your action low and tremolo in the right place.
Of course I cheat quit a bit when I work on guitars, I have a feel for what I can get away with, but every now and then I'll get the trem all whacked out and slacking the strings and a few hours rest before starting again is the answer.