Stack, (1) I don't trust the 1 uH coil value for one thing. What is really being driven with the circuit you built? (2) Your driver can pull up hard because of the Darlington, but it cannot pull down hard because there are no active devices to achieve that. (...) And there are other thoughts. But until those two are addressed, they don't matter. I also notice that you've cut off some of the chart and are using default node labels. It would help a lot if you would label your nodes on the schematic. This is your question after all. Put as much effort into it as you feel able.
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