The OP's breakage reminds me of a friend that once owned an off road machine. I went out a couple of times with him, and each and every time, he ended up breaking something. I found out later that he broke something every time out and it was costing him a pile of money. Axles, tie rods, knuckles, trailing arms, on and on, AND it was a brand new rig.... Finally he simply gave up, threw in the towel and sold his rig. Hmmmm... it wasnt about cheap or worn components, it wasn't about airing down, as he aired down with religious ferver. I went with him twice. I witnessed that he was very, very hard on equipment. The plain and simple truth? Finesse driving prevents breakage. Sometimes, yes, it is worn out or weak components, but just not very often. I think the OP, ( no insult intended here) simply made a mistake. When easing down a shelf, that manuever can easily put double the stress on front end components, and if not gentle, they are gonna give...
I usually air down from 32 to 20 psi for comfort, although I do understand the mechanical value in doing so...