STRANGE axel twisted?

Scott, few years ago when i was putting my duster together, most of the guys around me were using strange stuff. I good friend of mine with a heavey nitros feed big block chevelle, twisted his axle like yours, he called strange they told him "that was normal" and it should not twist anymore and if it goes past a certain limit (2 spines twist if i rember right) then change it, He raced the car for years 3700lbs chevelle on the rear bumper many times. I myself thought it was CRAP , so i put 30 spine moser stuff in mine, 5 years of 4 speed and now the 416 auto deal for the last 7 years and the axles have never twisted on me. 10.31@130 .