My prints have 'lawnmower' bands in them, it looks like two different colors laid in each pass in bi-directional printing

It is typically a function of ink order

In one direction K goes down first then C then M then Y
In the other print direction Y goes down first then M then C and finally K

These can cause 'chromatic' color shifts and this banding is known as chromatic banding.

Temperature can help and sometimes solve the issue,
Lows temps allow the colors to mix a bunch before dry
Higher temps will try the droplets faster and help prevent mixing.

Chromatic will not be evident when printing uni