Well, after living with the defective screen for far too long, I finally reached out to DaLite, and my vendor.
Over time, the tab tensioners (little plastic guides that glue onto the sides of the screen) started to come loose. This may be because I had left the screen in the down position for almost a year (since I was trying to get rid of the horizontal lines, and knew that rolling it up was part of the problem.) DaLite was happy to send replacement tab tensioners (for free), but I had to escalate to discuss what I could do about my out of warranty screen material.
In the meantime, the tab tensioners came in. I applied one like I was told (simply remove the old one, and put the new one in the exact same location. In a matter of a week, it was clear that the new tensioner was also starting to come loose. Again, this may be because I left the screen down, but they really should have a better way of affixing these things.
Eventually, DaLite via my vendor, offered a replacement at a cost that I was comfortable with. Still extremely expensive in the relative scheme of things, but better than nothing. At some point, my vendor expressed that the new HD progressive might be a better material for me than the Cinema Vision. It was also available in 1.3 gain, so I asked that samples be sent. I ended up liking the HD progressive 1.3. It is a more expensive screen material, but they offered the replacement screen at the same price that I had already been quoted for the replacement Cinema Vision. I went ahead with that order.
During this time, I also considered replacing the entire screen. Mostly because it now comes with a 5 year warranty instead of a 1 year warranty. They also now advertise "Smooth Roll Technology" which seems to indicate that the roller won't cause horizontal lines anymore. And, lastly, the new motor is supposedly quieter. Ultimately, I was told that my replacement screen material (and roller) would come with a 5 year warranty (and it would be this newer roller as well), so the only thing missing from an entire new assembly would be the quieter motor. But mine is quiet enough, and only used before and after viewing, so I didn't care.
Anyway, I hung the new screen two days ago, and have watched 4 movies on it since then. I could detect nothing "new" about the roller. It looks to be exactly the same rolled steel that the old one was. But, the screen looks amazing. I'm very happy. It's hard to remember what the Cinema Vision looked like when new, and I've been dealing with that screen's problems for a very long time, so some of my impression is definitely related to that...But in the end, DaLite, and my vendor did a pretty good job of keeping me happy. We'll see if I need that 5 year warranty or not...