Awesome work, +1 sticky

I also noticed on my own 7/16 x 5/8 3603 vs Masterkleer bending tests that the Masterkleer seemed to hold a round shape better.

If you wanted to do a follow up long term test, you might consider connecting a string of 4" pieces together with some low restriction 1/2" copper tubing to splice them and run them in your loop for a few months to see how the clarity holds up on each clear type.

My tygon 3603 seems to cloud up every bit as fast if not faster than Masterkleer. I have one offbrand tubing from home depot I use for my testing manometers that is very resistant to clouding. You can clean up the cloudiness if you pull the loop apart though, I have an aquarium tubing brush with an extension and a quick scrub makes them look like new.