My point precisely! If you understood it, you wouldn't be running 37 mm tires at 90 psi.

I really don't know what you are doing wrong, and I don't mean to lecture you. I get a lot of flat tires (I think the total was 25 for 2015), and the cause is not always clear, but over time you develop strategies for avoiding them as much as possible and dealing with them as efficiently as possible when necessary, and what works for one member of this subforum isn't always the best thing for another. You're going to have to figure this out for yourself.

But if your tires really measure 37 mm, you really don't need to run such high pressure. 40 psi rear and 50 psi front really should be fine. If you carry a lot of weight, you will need higher pressure. If you prefer a bumpier ride for some reason, your tires can handle it, but you won't get any advantage from it in terms of efficiency or flat protection. Indeed, if you prefer a bumpier ride, you might consider thinner tires.