How to make a KVR1333D3S9 work with a MacBook Pro 7.1?
There really isn't any trick for running RAM that your Mac doesn't like. It appears that Mac OS X is more forgiving of RAM problems in Safe Mode (which makes sense, when you think about it).

But it sounds as though one or both of the Kingston memory modules is bad. I suggest that you install one of the modules, then boot normally and run Memtest, then swap that module for the other one, and run Memtest again.

You can get Memtest for free at this link:

http://forums.macrumors.com/showthread.php?t=788590

If one module is bad, then exchange it. If both modules test OK, then you are still best off returning them to where you bought them for an exchange.