Print Uni-direction and if clear - then adjust your bi-direction settings
not sure what 160% hq wpass means
as said good starting point
can we see a pic of the sticker and the nossel test please
does the vp have a head height setting if so needs to be on low if possible may have to remove media clamps
what colour is the small text
the wpass indicates its using the intelligent pass system may wish to try with out.
Left label is settings I used on a EPS file. Right label is a previous printers label and the sharpness is what I am trying to achieve and top label is the first print I tested the label PDF file
I am aware the text is bigger on the other printers file- but I still need a bit more readability from the label I am printing.
Nossel test, I have just had this printer back from the technician he essentially brought it and the heads back from the dead from someone who was not using it for a year and it was left uncapped - so I am aware nossels are not prefect.
i think you could get close to the sample but every thing will need to be spot on settings the media and or profile is not helping, if you mean you have limited the ink load to 160% is partly to blame most digital print materials like around 220 to 260% total load, for best colours but in this instance all the colours involved are made up of just about all the cmyk so the settings of the heads is even more important.
as a by the way have you checked the content of the bottle will not attack the print you may need to laminate as well, got the t shirt for that one.
Nozzles seem good enough
Again print a sample unidirection - to see if it is better, if it is then adjust bi-direction
Also the other issue seems that you are not using the correct profile for the media.
what you were told is partly true but clipping the ink load will make the colours weak, catch 22 really.
you need more ink to get the colour but you can control the way its put down to help so it does not bleed
both my rolands use different profile to your printer so what you are looking for is.
print uni directional slow the head speed down to about 550mm /sec res need to be at least 720 x 720 and a least 16 passes, max ink load around 210%.. probably sign and display. head height low if you can needs care with head height.
that machine is very capable with a bit of effort (same heads as my old one) but have to admit the VS range is one notch better at this sort of thing.
best of luck