Firstly, the cartouche was not an inscription ever to be seen publicly. It was daubed quickly judging by the representation of the glyphs themselves and the paint drips, on a stone designated for a chamber which was sealed and to which no-one had access until gunpowder was used in the 19th century to blast their way in.
The placement of the horned viper being "high" is a nonsense argument. It is its placement in the word itself which gives it meaning, not how high up it is.
See above for why the positioning of the horned viper glyph as "high" (which I dispute) is not a convincing argument. The other inscriptions of KHWFW are formal inscriptions, carved in raised or sunk relief, which were meant to be viewed.
To which other graffiti inscription of KHWFW do you refer to substantiate your argument that positioning of the viper glyph is "anomalous" in the Campbell's chamber cartouche? - for that is what you claim in your post.
Anomalous in comparison to which other graffiti inscription? For the other CARVED inscriptions of a KHWFW cartouche differ in the respect that they were carved and also for PUBLIC consumption. The hidden, quickly daubed graffiti in a sealed chamber was not, however you try to spin it.