Those items you listed have to do with the overall quality of printing. I would think for general printing selecting Mixed Text and Graphics would be good.
Have you downloaded the latest drivers from Canon's website? If not, here is where they are:
You have to select your operating system then the downloads will show up.
Can you run a printer utility installed by Canon and select a nozzle check? I can select a nozzle check on my Epson printer and it prints out a test sheet of fine lines of each of the 4 colors used. If they lines have breaks in them or don't show at all, I have to run the clean print head button.
Sometimes you can access this utility in System Preferences/Printing and double clicking on your printer. Then you may see a Utility icon along the top of that window. Click that and see if you can do some sort of nozzle check.
As far as the size of the printing goes. In Preview when your document printed larger but not as large as you'd like, Go back to Microsoft Word and highlight some text and see what size font you are using. To give you a comparison, 72 points is one inch so, 36 point type would be a half inch tall and 18 point type would be 1/4 of an inch tall. Some fonts don't measure that exactly so it depends on which fonts are used also.
I just looked at the Canon site where I pointed you to for the driver. There is a Service and Support tab on that page. Click that, then click Frequent Asked Questions, then click How Do I Print A Self Test/Nozzle Test?.