k/t gallows reduplication

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TLDR: The k/t gallows sequence is strongly biased toward reduplication; especially long sequences of the same k/t gallows in a row.

What is interesting about it is that human-generated pseudo-random sequences have a "tendency to overalternate between outcomes" documented in psychology studies. See for example: You are not allowed to view links. Register or Login to view. and the referenced literature.

Why do we see the opposite tendency in the VMS?

I've also noted those k or t sequences and thought what it may mean, but I concluded that it is false impression that only k and t gallows have such long sequences in a row. I think they caught our eyes because of their tall shape in comparison to the major number of low characters. The text is full of long sequences of ch, sh, o, r, d, etc. They are not so notable in the text, but it doesn't mean that their strings less significant. 
As for me, I didn't consider them as some tricks of the code, I rather see it as a possible literary device. I mean that these repetitions of letters or sounds may be just a sign of literary consonance (including, alliteration) or assonance.

Consonance is the repetition of the same consonant sounds in a series of closely connected words in a sentence or a phrase. The repeated consonant sounds may occur in any part of the words - beginning, middle or end. Usually, you can identify consonance when you spot that the same sound is repeated in several consecutive words.
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Alliteration normally means the repetition of the same sound at the beginning of closely connected words in sentences or phrases. In most cases, the repeated sound is a consonant but is sometimes a vowel sound.
Alliteration is when a series of words start with the same sound. It is most commonly found in poetry but you can also find examples in prose, songs, rap, and even in people's names! Alliteration creates a memorable effect on the text, making it more engaging and easier to remember.
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• It can help to focus the reader's attention on a particular section or phrase.
  
• It can create a rhythm when reading something aloud.
  
• It can make particular words or phrases memorable and catchy.
  

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Assonance is the repetition of the same or similar vowel sounds in a series of words in a sentence or a phrase. Like consonance, the repeated sounds could appear at the beginning, in the middle or at the end of the words.

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The first thing that comes to one's mind is twisters like this one: Betty Botter bought some butter but, she said, the butter's bitter; if I put it in my batter, it will make my batter bitter. But a bit of better butter, that will make my batter better.
Also I noted that ancients loved to construct such repetitive phrases in Latin. For example, phrase "Vi veri universum vivus vici", or mentioned by me earlier song "Veni virgo virginum".
The most famous medieval verse herbals are Mocer's De viribus herbarum and Henry of Huntingdon's Aglicanus ortus, but it needs to be examined whether they used such devices as consonance or they didn't. In general, I think it is possibe that the VMs contains some parts of the verse text, no matter, the author's own one or copied.