As Irving said I did change for a more powerful stepper and also changed to parallel drive.
I did try all the options for lower acceleration but they all made no difference that I could detect.
I may in the future try and balance the head but at the moment I am thinking more in the way off removing some of the flex in the column, I am also trying to work out the options of changeing the way the Y-axis works by siting the stepper to the rear and fixing in place instead of moving with the Y-axis. aka KX1.
My biggest headache with the rear siting is the head tilting mechanism I may get rid if it altogether and make a new support for the Z-axis arm, just need a great lump of metal!

Peter