Re: Tip of Mast hit bridge...
"Might have to release the shrouds at the chainplates. "
Usually will have to do that. It helps to wrap a piece of tape at the exposed thread, so when you go to raise the mast again, you can just screw the turnbuckle "back to the tape" and you'll be near the correct tension on them. (You'll still want a tension gauge to set them up 100% properly, but the tape gets you close.)