I’ve always wrapped my bars this way round though and it never shifts unless you wrap it in the other direction. I could tell this stuff wasn’t going to stay put when I first put it on because it was already moving around when I pulled it tight. The double-sided ought to hold it for now.
should be wrapped the other way around, innit? starting from the bar end (that way the overlaps won't open up and separate).
also, i'd put a mighty car mods 'chopped' sticker by the model designation on the downtube :)