I don't keep any of my snakes in racks so I don't know if that influences things - but I have to say that your warm side temps are significantly warmer than the warmest temperatures my snakes - including my Royal python - prefer (with the exception of my sand boas).
Generally they all seem to prefer hanging out on the cooler end (about 78F), occasionally choose hides or perches in areas of their enclosures that are about 82-84F, and rarely bask at 90-91F. This is describing snakes in large enclosures with basking shelves, climbing branches, multiple hides, and multiple 'micro climates' to choose from so I may be describing a situation that is not at all relevant to a rack environment.
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