Mimaki CJV150 mottled print and fuzzy test print

I have noticed the print quality of the Mimaki has gone really mottled and the test print doesn't seem as crisp as it use to. The black seems to seep into the yellow.

Ignore the smudge the material wasn't very flat.

Using corel draw to Rastelink
have played around with the heat settings going from 30-50 degrees
slowed the print down to normal
resolution changes
recalibrated spray and alignment

I am using Jetbest ink cartridges for a year now. The temp of the room can get around 14 deg if that has any effect to the ink?

Any help would be appreciated. I have scoured the internet to no avail. Thanks.

 

Thanks for the suggestions guys.

Heaters are on as I have tested them from 30-50 deg C
I recalibrated the print (drop pos correct) and media comp
Adjusted the height of the head to lowest position
Not tried uni direct but I have always printed in bi direction and never had mottled print
default speed is usually fast but I have slowed it down to normal and it is sloooow so if I make it unidirectional too its gonna be even more sloooooooow

Media is new gloss vinyl and matt vinyl (poli-tape)

It baffles me as I think I have tried everything except change the ink.