Nick – For your 30 min stack the length of the trails in your image is around 50 arcsec. The Hubble image that Denis linked shows a short (approx 4 arcsec) and very faint extension in PA 300 or so. I doubt that you are detecting the coma yet but your image is definitely of high quality.
The HST constraints on nucleus diameter are interesting. Details are in the ArXiv paper here: https://arxiv.org/pdf/2508.02934.