If you could find some time to reformat this, it would help greatly.
I understand you might not have these models, but what I would do ...
1. Give the Librarian a second power, probably GOI for quick travelling - can be huge in small games. Then put him in Terminator armor with a SS. You won't want to be shooting that plasma gun and end up putting wounds on your HQ, when most of the time you can shoot with smite and kill more models anyway. Now he's durable. The librarian's glaring weakness is the lack of an invulerable save, and this remedies it.
2. Change the Rhino to a drop pod, and make the Librarian drop with them. You can still combat squad if you want, but now you can come down 1st turn wherever you want and unleash all your bolter/flamer goodness along with smite from the librarian. This is the configuration that I run, and I have to say I'm quite fond of it. I haven't tried it in games less than 750 points though.
3. I think you should have about 30 points left now, but use whatever points you have left on adding more snipers to that squad. Bulk up their numbers to help them survive incoming fire and actually cause some wounds. If you don't wanna do that, put a PF on the tactical squad to help handle CC.