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The Shimano SPDs usually have a tapered cr-mo axle that is fairly sturdy. It weighs quite a few grams more than the axles on my Suntour XC Pro and Suntour Superbe Pro pedals, and the inboard bearing is closer to the crank than the Suntour pedals by half the distance. So the shearing stresses on the axles should be only half.
I rode the XC Pro pedals for 23 years before catastrophic failure on the left pedal axle. And it broke right at the face of the inboard bearing, where apparently, it looks like there was a defect in the hollow-axle extrusion. I've never broken any other pedals in over 30 years. And I've been at least 50 lbs heavier than you for most of those years and honking up hills all the time. And the XC Pro were the pedals I used a lot in off-road. So I doubt you're even close to any fatigue limit on your SPDs.