Hello @cbjrobertson,
thank you for your question.
It seems that you have a similar problem as described here: Unable to train textcat model using en_core_web_md as a base model
The solution my colleague Vincent found was to use a spacy-config file as workaround, see: Unable to train textcat model using en_core_web_md as a base model - #4 by koaning
For your problem, you would have to change the model from en_core_web_md to en_core_web_lg.
Can you try this out? Maybe this works for you too.