If the FR-1000 is the same bridge Charvel put on the USA Promods, then I'll say this:
I've had my KFR-equipped Charvel since July 2008. The bridge stays in tune amazingly. Divebombs return back to perfect tune. No stripped threads or worn out knife-edges. I am considering getting a brass block, however, just to see if it has a large effect on tone.
I wouldn't even think about switching to a German OFR unless the current bridge somehow became unusable.