CURIOUS AARDVARK .
I have been doing four outlines and has helped and on the last big base item I am doing one side did not print so was able to alter the bed while printing and the fourth outline came good. Guess you should have the bed right first but it worked.

I think a lot of my problems have been because the bed was not level. I think it changes all the time as the bed springs in two corners were very loose when bed correct. So I have now stretched out the springs and replaced them and maybe it may be better.

On one side the wing nuts on the bed are screwed out a lot more than the other. Guess the next thing is to work out adjusting Z axis to make the bed sit better but at last it is printing good.

Thanks