Hi Neil
Your comment “So the question is am I doing something wrong or was I unlucky, should I be adding oil first then petrol in the hope for agitation from flowing petrol??” is what I normally do and I don’t have any immediate problems running, however if I lay up the bike (and I do) when you go to re-use my bikes they can be temperamental but once warmed up usually things get back to normal.
I also keep handy a plastic fuel cam with pre mix so if I am getting low I can use this and of course it’s easy to gently shake …..
ATB Stuart