Print a cone with bottom radius of about 1 cm and top radius about 0.5 cm. Make it about 5 cm high. Measure the height with callipers. If the height is not correct then your steps per mm are wrong. Fix steps per mm first. It does not make sense to calibrate anything else if your steps per mm are wrong. When your steps per mm are correct then go on calibrating diagonal rod length and delta radius (or even the tower positions if your geometry is not symmetric) so that bed level z-height is flat. If your bed is flat (and perpendicular or almost perpendicular to towers) then you do not need to care about X/Y dimensions. Just calibrate the bed level z-height and when done then the X/Y dimensions must be correct too. That is a feature of delta printers X, Y, and Z errors are all tied together. When one of them is correct across whole print area then the other 2 will be correct too.
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