The coriander bitters and saline sound like great additions, will definitely be trying that next time. I was thinking of it almost like a (very distant) negroni cousin, I use the 1.5:1:.75 ratio for my negronis as well.
Thanks Evan, can confirm this is an excellent ratio! My favourite ‘classic’ Negroni yet! Used ford’s gin which is really properly punchy took hold its own against the Campari.