Update
Redid the process again this morning, was able to take a bit more time as I’ve got the day off, took the starter motor off, and set all pilot screws to 2 1/2 turns out, as in the Haynes manual, got everything set up, I found I could just prop the tank up, like a car bonnet, using a bit of plastic waste pipe with notches cut in The ends to secure it against whatever shape it touched at each end ( I’m a plumber, so got odd lengths of all sorts of pipe laying around )
Made sure I had the carbtune in a dead vertical position, did TPS, warmed up and found no 3 was way out, 1&2 needed a little adjustment 3&4 needed a big adjustment, then 1&2/3&4 needed a big adjustment.
So, after that it ticked over a lot better, sounded a lot smoother and picked up on the throttle a lot better, not been out for a ride yet, knees a bit sore as I did a 45 mile charity cycle ride yesterday, so I’ll check that in due course.
Thanks for all the help 👍