Here is the link to the transformer. It’s the 1570, not the 1570XL
https://www.lundahltransformers.com/wp-content/uploads/datasheets/1570_0xl.pdf
I am not operating this transformer beyond it’s frequency range. So you’re right, Im probably worrying for nothing. I am getting a little worried about the windings acting like a hidden resistor, or inductor. Causing a corner frequency that I am not aware off. I worry about my bode plot being affected by it.
As you can tell, I have no idea what I’m doing half the time. But thank you Kelvin.