So, I tried a few more things to check/double check.In the end I have my Esteps back in the 354 range.The issue turned out to be the hot end, a crappy Swiss mk9 even, this is now back in its bag in the spares box.Creality hot end on the DD and it is working great after a bit of levelling, it is possible that the fan cowl was cooling the SGmk9 down too much but like they say if it ain't broke....So thanks, I'm mean really thanks to the 240+ who read my post and didn't have an opinion, I got help from a 3d printing section on drone forum of all places.