Assistance needed with final suspension rebuild steps

So, here I am one year later and being told my LCA bushings are shredded and need replacing. I'm confident I followed the steps I laid out in my original post. I'm not sure where I went wrong. My alignment guy says I probably tightened the LCA nuts before lowering and that is a common mistake. I could have sworn I didn't tighten the LCA nut before lowering; but could I have caused this failure by adjusting the adjuster screws BEFORE I lowered it? (as I mentioned in my step 1 above)
The UCA bushings are fine, per my alignment guy.
The original alignment (a year ago) was done by Big O using the Skosh chart numbers I gave them. I also had them adjust the ride height while they were at it (I was off a bit).
Not wanting to point fingers, but could they have done something to cause the premature failure of my LCA bushings? (I have since found a new alignment expert familiar with older cars)
Thanks for reading
Danny