Welcome to the forum! I think you shouldn’t worry to much about basking warmth with the milksnake. The warm side of 86F- 88F should suffice for them. Cool side of 73F - 75F will be sufficient for him\her. Remember also they are colubrids that are primarily nocturnal and do better on the cooler side. In the wild, the milksnake is known to seek shelter under rocks and shaded areas to escape hot days. I really feel a range of 73F-88F tops will suffice and bring out the activity in the reptile. They inhabit a wide range of habitats thus are very adaptable and thrive in cooler to moderate temperatures. If your shooting for a bit cooler you will be fine.
Stay in peace and not pieces.
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