Hi Mike,
i hope you don’t mind. I had a go at processing your spectrum image in BASS:
I calibrated it using the emission line wavelengths from one of my own Alpy spectra. And I made a response correction using the reference star BD +60 2540 that you highlighted in your image. I used the Pickles reference for an A5III star because there is no reference for an A5II. I think the calibration and response correction came out pretty well:
Anyway, it was a bit of fun and I think it shows the quality of your spectrum down in the green-blue end. I think the red end was maybe saturated in your image which could explain the fat, squat appearance of the Halpha emission
Cheers
Hugh