I tried lowering the S value from S5 to S1 in increments of 1 and these seemed to make the issue more apparent each time, so i then adjusted upwards settling on a value of S8 which so far after testing the home position roughly 30x seems to provide a good solid repeatable homing position, I’m super happy with it now!
Thankyou for you’re replies, I really appreciate the help
Thanks
Tom