Your near mastery of the English language makes for a clear and delightful read, well done sir. I too love my XLC. I didn't get the top cover with it though, as I apparently didn't click on it when I thought I did. So to remedy this, Zilla sold me an extra that he had in
hopes that the zippers would line up. This wasn't the case, however I was still able to use it by keeping the netting on, putting the cover over it and toggling the cover to the ends as well. I then clipped it into the tie outs with the netting. The end result is that the cover is only slightly loose and provides nearly complete coverage like it would normally. Once my UQ is on, the flap of fabric for the footbox of the cover is tucked in and it doesn't matter that its not zipped on. One advantage of doing it this way is that since its not zipped on, and the entry side tie outs of the net prevents the cover from covering the netting between the zipper and seam where the tie outs attach,it creates a vent that's just netting the length of the part thats pulled out. So even with the netting and cover on I have never had a condensation problem. Using the RL quilt hooks on my 0° Incubator also helps to keep the cover tight. Maybe give it a try and see if it helps your condensation issue. One other advantage is that having both the net AND cover on seem to keep even more heat in than just the cover would. You can see what Im talking about in the video I did starting at about the 2:50 mark ~
https://m.youtube.com/?reload=7&rdm=...?v=O3S8oBjhDoE
And this one at about the 3:00 mark :
https://m.youtube.com/?reload=7&rdm=...?v=NYHbmcyP2Ak