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Alan,
The 500mm fl you're using and the current spacing between the grating and the camera chip are giving good results.
The only issue I can see is the focus...
With practise this can be improved.
IMHO there's no need to spend $$$ on any special adaptors.
(Eta, as Robin said shows a spectrum in the -1 order, and I think if you look closely you'll even see a further -2 image !!)
I would take more spectral images to refine your focusing techniques and enjoy the ride!
When you want to start processing the image, I'd recommend trying BASS Project to prepare wavelength calibrated 1D profiles.
Well done!
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