I understand that. With migratory covers one doesn't have too many choices. But than you have it down pat, with all your years of trial and error.
My concern, in Rays' case, he has telescoping covers!?
I too had made some boners through the years. I still do, not intentionally though. Often just from plain forgetfulness, too much of a hurry, or taking things for granted. But I should add, that those boners are of more benign nature, cause bees lives and well being, that I take rather seriously.
I find that in our harsh winters, (our temp's are minus 30, for about a month now) so mother nature is not too kind with those who are prone to mistakes, or are not too keen on good-meaning advice...
What I am concerned about is, that telescopic covers tend to take in the cold on the sides and one usually ends up with wet bees or at least very cold and uncomfortable ones in the best of cases.
Main thing is: Migratory cover, Styrofoam on top. Telescopic - Styrofoam on top of inner cover and we all can sleep better...
I am glad that Ray is already taking appropriate measures, to correct things, as we speak. In my book, such people tend to have a better road to travel on. And that make me sleep better... :-D