That is strange that you still have a code, especially if it ran smooth. That code 'injector circuit open' is used to describe the electrical condition of the injector or it's circuit, such as a broken wire or open line in the magnetic coil inside the injector. Or, worst case scenario, a failure of the injector driver in the ECM, though I think there's a separate code for that. It wouldn't indicate a blockage in the injector or the intake. What did you do to find you had flow? It would still be best to test the circuit somehow before adding something.
If you don't have access to a good testing method, it might be time better spent just replacing the injector, so long as you can get a new one reasonably or a known good used one. This might be an excuse to do the 4-hole injector upgrade...IIRC you can sometimes get an entire set for less than $180. It's said you gain a smoother idle, at the very least. It's been something I'm considering recently, but I don't have any personal experience. You can find more here:
There's probably a few threads here on the forums about it as well.