As Al said there are too many variables. Anyway, I've never been convinced that tire pressure in any way correlates to flats, except snake bites form extremely low pressure.
Tread side flats could be from bad luck, softer tread compound, seasonal (thorns) issues, or any number of other causes. Belly side flats are usually the result of a bad rim strip, poor mounting, or crappy tubes.
Questions, why did you tamper with success? You were doing fine before, were the new tires narrower?
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