Vertical alignment very poor and seems impossible to fix

@epsonuser post an image of what a printed page looks like. that way we can see what you see and hopefully get you some idea on how to fix it. Adding images to an existing question

@nick take a look at this one. See if you have an idea

The pics are of your vertical alignment.

Row 1 is alignment 1 so you have to pick the best vertical alignment.

So your row 1 i would pick number 4.

Row two looks bad but you will have to analyze which one looks best and then repeat. You should be at all 4’s when done

I am having this exact problem right now in my WF-7720 and my alignment pages looks just like yours. My printer is using sublimation ink. My nozzle check shows some broken lines so I am using a syringe and tube to put hot cleaning solution through each colour to try and get rid of any blockage. It helped me get line #4 to have solid boxes (it used to have the gaps between the vertical lines). But since then, I can see no change between alignment boxes. I changed the re-fillable ink cartridges to new ones and topped up each cartridge with fresh ink. Still no change. I print lots of purge sheets and they come out with some streaks, so my plan is to continue with the hot cleaning solution over the next month. If no improvement, I am guessing my printer head is defective maybe. After the cleanings and when I get ink flowing again, I try doing many vertical alignments but I can't tell aside from line 1 and 4 that there is any difference. If I get any new improvement, I will update here.