Yeah, the osprey isn't a deepwater bait like the basstrix or optimum, it's more of an upper level bait. It does sink though, so you can work it however deep you want. Pro rigged means that the bait has an added treble hook toward the tail, connected to the original hook with a length of braided line, and a piece of tubing where the metal wire harness is in the stock bait. That prevents the bait from ripping. I highly suggest rerigging your ospreys, or you will catch a fish or two and it will rip apart. As for getting swimbaits to swim, the only real way you can mess with them is to cut the underside of the tail. If you're looking at the bait from the side, you want to cut the underside of the tail section at the narrowest point. A swimbait looks something like this: |____/---\ (head on the left, tail on the right). You're going to want to cut the underside of the --- portion. That will help a bit but it won't make it perfect. If a bait is running crooked the only real thing you can do is add weight to the bottom, or try tweaking the line tie, that might work, but I've never tried. I don't think it would work the same as a crankbait.
-Brian