I know Do It Corp. sells big Y guards for molds but don't know if they make them Y guards big enough for a 2 oz. jighead. The big Y guards are pretty stiff for the lighter ones I've see (like 1 oz.) I would recommend you call them and if they don't have it ask if their blank molds could be used to have someone work it up for you but only if you can make the Y guards for the 1 oz. work.
If Do It isn't selling them, try this site again and just ask where you can get bigger Y guards. There's another company that makes them but I can't remember their name. (want to say it starts with a "B" but not sure) If I an find it, I will get back with you.
I would think that rockfish hit hard and these should work for you. If you find it, get back with me and I'll give you a tip or two that has worked for me when using Y guards. Good luck!