Is this VFA?

Are these faint vertical lines VFA, and if so, how can i make them less noticeable. They seem to be worse on the black gloss PLA has the light shows them up more.

I am also having another problem where the x axis dimensions are slightly off, around 0.4 mm over a 100mm distance. I have cleaned the x axis rods thoroughly and oiled them with a very light 3in1 oil to see if they will ‘wear in’. The belt tension seems about right has well.

Creality have sent me two new rods and graphite bearings but that is a last resort has its a lot of dismantling to replace them.

You can have look linear rail mods, which meant to help with that VFA or if you have older stepper motor that could be the issue.