It could just be the viewer you are using, are those screen shots from Garmin Connect? For example, if you open the same track in the Garmin Connect "Player" the resolution will get even worse. Try export the track and open it in another app, such as GPX Editor.
I use the Buzz Rack Buzzy Bee 4, I've had 2 29ers and 2 26ers on it at once, fits quite easily, you just need to make sure the handlebars and saddles don't get in the way. Edit: lowering the saddles helps a lot
When it comes to 26er tubeless tyres, I really like the Maxxis Aspen Exception Series. I ran them on my 26er, and know 3 others also using them in a tubeless configuration. They go for around R300 to R350. Some people are weary of them because they are light and have thin sidewalls, but I've never had an issue.
