I play with a really low action and the only thing I did on one jazz was to widen the nut slightly when I tried some heavy flats , I used an old roundwound string to widen the slot , which was a good little trick
I’m confident to set up most my basses, perhaps not a vintage one, I would leave that to a professional, but all the basses I’ve ever had have never needed anything done to the nut , it’s one thing I wouldn’t touch
The 414 is very good, and it’s got a single action truss rod I believe, which failed on mine, the 1024 which I’ve got now has a double action one which I think is a good improvement, apart from that I would definitely have another
From what I remember my 414 had a very shallow neck from front to back, really nice to play, and my1024 isn’t much different but maybe a touch more rounded
Very happy to leave feedback for Brian, he sent my parcel the same day and in Bomb proof packaging, great communication and a gentleman to deal with, many thanks, Tony ☝️