Hmm, it seems to be the experience of many that the shorter Easton stakes do not hold in the wind as well as the longer model.
I found the link to the test! I carried the longer Easton stakes with me for this very reason. Did much better in Southern California, where stake length seemed to be critical compared to other parts of the trail where the soil composition was different (less sand).
I suspect you are correct, with fewer stake points, stress on each peg becomes greater.
I remember it being really, really windy toward Pioneer Mail Picnic Area. I mean, it was blowing sideways out there. That may have been the worst wind experienced on the entire trail. There wasn't much in the way of wind protection, either.
Best of luck during your great adventure. Say hello to the fine folks Drakesbad Ranch in Lassen National Park. It was one of the great unexpected moments of joy for me. They treat thru-hikers really, really well. Much better than we deserved!