Officejet Pro 8000 cuts off some top or bottom halves of lines of print

[PF-Flyer58]

My OfficeJet Pro 8000, with brand new print cartridges, is doing two things I want it to stop doing:
First, it cuts off the top of some lines (prints the bottom of the letters but not the tops). This happens in MS-word, in Google Docs, and with PDF files. 
It happens in Mac.   

It also happens in Windows 10, which does not print PDF files at all, but it does print Google Docs and MS-word docs. 

Second, it prints a test sheet after every print job, which wastes paper and ink. Stupid. How top stop?

I have read on HP discussion threads that  "Deskjet 6980 (driver) is compatible with your Officejet Pro 8610 as well" and some use this   Deskjet 6980 driver as a work-around to get the OJP 8610 to stop making similar errors with cutting off parts of lines. 
But if the OJP 8000 series driver is making these errors, and the DJ 6980 works, then why doesn't HP simply fix the 8000 series driver by replacing it with the other driver that works??

Cut-off lines: 

The test sheet that prints every time:

[PF-Flyer58]

So I guess the third issue is this: 
How to get it to print PDFs in Windows 10? 

The printer cartriges were purchased from an office supply chain store, not HP directly. 

And I have no idea how to download and install a Deskjet 6980 driver and tell my printer to work with that driver instead of my 8000 driver, when drivers are either in the system (Win 10?) or automatically downloaded according to what is plugged in (Mac). 

You really need to make these things work more easily. Consumers should be conpensated if they're being used to beta test your defective drivers. 

[PF-Flyer58]

I received an email from HP, telling me to call a number because the problem could not be solved in the discussion forum. 
I called the number, and a person had me download a program to allow them remote control of my laptop. 
He checked my system and noted some processes that were running, some stopped, and claimed the stopped ones were the cause of the printing problems with my OJP 8000. 

But I explained that I have three other HP printers (which cost more per page to print), which are working fine, no problems, and I said I'd bet that the processes would still be marked as "stopped" when those other HP printers are working fine. 

While he was on the phone and still had remote access, I did a test with one of those other printers. It worked fine. 

I noted to him that some of the processes were still marked as running, and others markes as stopped. 

Then he clicked the heading "Status" - which sorted the list so that the running processes were all at the top, and the stopped ones hidden off the screen.

He claimed, see, they are all running when you are hooked up to the printer that is working, but not when you are hooked up to the 8000.  

In other words, the tech person was trying to trick me. I clicked the same status heading and showed him all the stopped processes, which then came to the top. 

He quickly closed the system process view and made excuses. 

I explained that at any one moment, I am not using all the capabilities of my laptop, so of course, some processes that are not being used would be stopped. 

Essentially, he was trying to blame the problem on a diversion, hoping I knew less about my computer than he did. 

Meanwhile, after cleaning the printheads a number of times, the only test pattern (dark, medium, light) that had streaks of white was the black ink. 
So according to this page, I need to replace the (NEW!) black cartridge:
https://support.hp.com/us-en/product/HP-Officejet-Pro-8000-Printer-series---A809/3760400/model/37604...

Very unethical for a tech person to operate that way. 

[PF-Flyer58 · Accepted solution]

I have learned that, although I installed a 4-pack of brand new HP ($!) ink cartridges and did various test pages, troubleshooting processes and head cleaning, 
this does not mean that a new HP print cartridge 
will be a functional print cartridge. 

After many tests, it turns out that the NEW black cartridge in the set 
was defective. 

But this required a lot of wasted time, running tests, using up printer paper, 
wasting the other colors from the colored ink cartridges that were actually working, 
but spewing out their ink over and over on text pages. 

The tests showed the black dark-medium-light test blocks were broken with white lines, 
and this indicated a problem with just the new black cartridge. 

The office supply chain store exchanged the bad one for another, which worked. 
So my advice to others with this problem is to go right to those tests
(which start with holding power button down while pressing paper feed button twice). 
If you do that twice and have the same color cartridge printing a test block with broken white lines, 
then you need to replace that cartridge. Save your receipts, because new doesn't mean functional, 
even if you pay full price for official HP products.