Your results look promising! 
I’m still in the process of cleaning up the STDP code that was sent to me (I’ve been working on another problem), and I hope to have it posted here mid next week.
As for your question about the BCM rule and the lateral inhibition, I will have to default to @tbekolay’s opinion on this. I’m not super familiar with that rule, and he’s the original author of Nengo’s implementation of it.