It's an easy oversight… "E" in your formula is intended to be phase-to-phase balanced quantity.
Your voltage measurements were from connecting a meter phase-to-neutral... 120V.
The cure is repetition, repetition, repetition.
A sanity check may be looking at the stator leads—thinking, "Are these more like 70-amp leads, or are they closer to 200-amp leads?"
Working with transformers and capacitors use the same calculations, but take time and experience to make sense.
to memory, then beat into your head the cases where 3ø and square-root-of-3 apply.