Believe it or not, a major source of the ears getting broken is the U-joint caps spinning. When they spin they spit out the clips. From there it's only a matter of time to you have total failure. Tack weld the cups to the yoke.
my recolection clutch type ls diff are tuneable, stiffer or weaker cup spring, or double up either or drive/ driven plate and u can get it close.i did these tricks in i.t. road racing diffs.and use shaefer oil.The Trutrac was specifically designed for front solid axles. Yes its a limited slip which is good or at least OK for a front. An advantage of the limited slip is it is friendly to stock axles.
ARB sure is a winner, but is not friendly to stock axles, especially on a heavy rig like a Blazer. Going with an ARB alloy forged axles are probably a must. On my latest rig - D44, Superior triple heat treat forged axles with the ARB. Superior is gone and now the go source is Revolution. Having said that spend more dollars and RCV axles are made of 300M and are even stronger than any others.
BTW, my stock axles looked like yours, then I upgraded to alloy axles. No more issues.